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components/ScrollKeybindingHandler.tsx

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🎯 Use case

This file lives under β€œcomponents/”, which covers shared React UI pieces. On the API surface it exposes shouldClearSelectionOnKey, selectionFocusMoveForKey, WheelAccelState, computeWheelStep, and readScrollSpeedBase (and more) β€” mainly functions, hooks, or classes. Dependencies touch React UI. It composes internal code from context, hooks, ink, keybindings, and utils (relative imports).

Generated from folder role, exports, dependency roots, and inline comments β€” not hand-reviewed for every path.

🧠 Inline summary

import React, { type RefObject, useEffect, useRef } from 'react'; import { useNotifications } from '../context/notifications.js'; import { useCopyOnSelect, useSelectionBgColor } from '../hooks/useCopyOnSelect.js'; import type { ScrollBoxHandle } from '../ink/components/ScrollBox.js'; import { useSelection } from '../ink/hooks/use-selection.js';

πŸ“€ Exports (heuristic)

  • shouldClearSelectionOnKey
  • selectionFocusMoveForKey
  • WheelAccelState
  • computeWheelStep
  • readScrollSpeedBase
  • initWheelAccel
  • ScrollKeybindingHandler
  • dragScrollDirection
  • jumpBy
  • scrollUp
  • ModalPagerAction
  • modalPagerAction
  • applyModalPagerAction

πŸ“š External import roots

Package roots from from "…" (relative paths omitted).

  • react

πŸ–₯️ Source preview

import React, { type RefObject, useEffect, useRef } from 'react';
import { useNotifications } from '../context/notifications.js';
import { useCopyOnSelect, useSelectionBgColor } from '../hooks/useCopyOnSelect.js';
import type { ScrollBoxHandle } from '../ink/components/ScrollBox.js';
import { useSelection } from '../ink/hooks/use-selection.js';
import type { FocusMove, SelectionState } from '../ink/selection.js';
import { isXtermJs } from '../ink/terminal.js';
import { getClipboardPath } from '../ink/termio/osc.js';
// eslint-disable-next-line custom-rules/prefer-use-keybindings -- Esc needs conditional propagation based on selection state
import { type Key, useInput } from '../ink.js';
import { useKeybindings } from '../keybindings/useKeybinding.js';
import { logForDebugging } from '../utils/debug.js';
type Props = {
  scrollRef: RefObject<ScrollBoxHandle | null>;
  isActive: boolean;
  /** Called after every scroll action with the resulting sticky state and
   *  the handle (for reading scrollTop/scrollHeight post-scroll). */
  onScroll?: (sticky: boolean, handle: ScrollBoxHandle) => void;
  /** Enables modal pager keys (g/G, ctrl+u/d/b/f). Only safe when there
   *  is no text input competing for those characters β€” i.e. transcript
   *  mode. Defaults to false. When true, G works regardless of editorMode
   *  and sticky state; ctrl+u/d/b/f don't conflict with kill-line/exit/
   *  task:background/kill-agents (none are mounted, or they mount after
   *  this component so stopImmediatePropagation wins). */
  isModal?: boolean;
};

// Terminals send one SGR wheel event per intended row (verified in Ghostty
// src/Surface.zig: `for (0..@abs(y.delta)) |_| { mouseReport(.four, ...) }`).
// Ghostty already 3Γ—'s discrete wheel ticks before that loop; trackpad
// precision scroll is pixels/cell_size. 1 event = 1 row intended β€” use it
// as the base, and ramp a multiplier when events arrive rapidly. The
// pendingScrollDelta accumulator + proportional drain in
// render-node-to-output handles smooth catch-up on big bursts.
//
// xterm.js (VS Code/Cursor/Windsurf integrated terminals) sends exactly 1
// event per wheel notch β€” no pre-amplification. A separate exponential
// decay curve (below) compensates for the lower event rate, with burst
// detection and gap-dependent caps tuned to VS Code's event patterns.

// Native terminals: hard-window linear ramp. Events closer than the window
// ramp the multiplier; idle gaps reset to `base` (default 1). Some emulators
// pre-multiply at their layer (ghostty discrete=3 sends 3 SGR events/notch;
// iTerm2 "faster scroll" similar) β€” base=1 is correct there. Others send 1
// event/notch β€” users on those can set CLAUDE_CODE_SCROLL_SPEED=3 to match
// vim/nvim/opencode app-side defaults. We can't detect which, so knob it.
const WHEEL_ACCEL_WINDOW_MS = 40;
const WHEEL_ACCEL_STEP = 0.3;
const WHEEL_ACCEL_MAX = 6;

// Encoder bounce debounce + wheel-mode decay curve. Worn/cheap optical
// encoders emit spurious reverse-direction ticks during fast spins β€” measured
// 28% of events on Boris's mouse (2026-03-17, iTerm2). Pattern is always
// flip-then-flip-back; trackpads produce ZERO flips (0/458 in same recording).
// A confirmed bounce proves a physical wheel is attached β€” engage the same
// exponential-decay curve the xterm.js path uses (it's already tuned), with
// a higher cap to compensate for the lower event rate (~9/sec vs VS Code's
// ~30/sec). Trackpad can't reach this path.
//
// The decay curve gives: 1st click after idle = 1 row (precision), 2nd = 10,
// 3rd = cap. Slowing down decays smoothly toward 1 β€” no separate idle
// threshold needed, large gaps just have mβ‰ˆ0 β†’ multβ†’1. Wheel mode is STICKY:
// once a bounce confirms it's a mouse, the decay curve applies until an idle
// gap or trackpad-flick-burst signals a possible device switch.
const WHEEL_BOUNCE_GAP_MAX_MS = 200; // flip-back must arrive within this
// Mouse is ~9 events/sec vs VS Code's ~30 β€” STEP is 3Γ— xterm.js's 5 to
// compensate. At gap=100ms (mβ‰ˆ0.63): one click gives 1+15*0.63β‰ˆ10.5.
const WHEEL_MODE_STEP = 15;
const WHEEL_MODE_CAP = 15;
// Max mult growth per event. Without this, the +STEP*m term jumps mult
// from 1β†’10 in one event when wheelMode engages mid-scroll (bounce
// detected after N events in trackpad mode at mult=1). User sees scroll
// suddenly go 10Γ— faster. Cap=3 gives 1β†’4β†’7β†’10β†’13β†’15 over ~0.5s at
// 9 events/sec β€” smooth ramp instead of a jump. Decay is unaffected
// (target<mult wins the min).
const WHEEL_MODE_RAMP = 3;
// Device-switch disengage: mouse finger-repositions max at ~830ms (measured);
// trackpad between-gesture pauses are 2000ms+. An idle gap above this means
// the user stopped β€” might have switched devices. Disengage; the next mouse
// bounce re-engages. Trackpad slow swipe (no <5ms bursts, so the burst-count
// guard doesn't catch it) is what this protects against.
const WHEEL_MODE_IDLE_DISENGAGE_MS = 1500;

// xterm.js: exponential decay. momentum=0.5^(gap/hl) β€” slow click β†’ mβ‰ˆ0
// β†’ multβ†’1 (precision); fast β†’ mβ‰ˆ1 β†’ carries momentum. Steady-state
// = 1 + stepΓ—m/(1-m), capped. Measured event rates in VS Code (wheel.log):
// sustained scroll sends events at 20-50ms gaps (20-40 Hz), plus 0-2ms
// same-batch bursts on flicks. Cap is low (3–6, gap-dependent) because event
// frequency is high β€” at 40 Hz Γ— 6 = 240 rows/sec max demand, which the
// adaptive drain at ~200fps (measured) handles. Higher cap β†’ pending explosion.
// Tuned empirically (boris 2026-03). See docs/research/terminal-scroll-*.
const WHEEL_DECAY_HALFLIFE_MS = 150;
const WHEEL_DECAY_STEP = 5;
// Same-batch events (<BURST_MS) arrive in one stdin batch β€” the terminal
// is doing proportional reporting. Treat as 1 row/event like native.
const WHEEL_BURST_MS = 5;
// Cap boundary: slow events (β‰₯GAP_MS) cap low for short smooth drains;
// fast events cap higher for throughput (adaptive drain handles backlog).
const WHEEL_DECAY_GAP_MS = 80;
const WHEEL_DECAY_CAP_SLOW = 3; // gap β‰₯ GAP_MS: precision
const WHEEL_DECAY_CAP_FAST = 6; // gap < GAP_MS: throughput
// Idle threshold: gaps beyond this reset to the kick value (2) so the
// first click after a pause feels responsive regardless of direction.
const WHEEL_DECAY_IDLE_MS = 500;

/**
 * Whether a keypress should clear the virtual text selection. Mimics
 * native terminal selection: any keystroke clears, EXCEPT modified nav
 * keys (shift/opt/cmd + arrow/home/end/page*). In native macOS contexts,
 * shift+nav extends selection, and cmd/opt+nav are often intercepted by
 * the terminal emulator for scrollback nav β€” neither disturbs selection.
 * Bare arrows DO clear (user's cursor moves, native deselects). Wheel is
 * excluded β€” scroll:lineUp/Down already clears via the keybinding path.
 */
export function shouldClearSelectionOnKey(key: Key): boolean {
  if (key.wheelUp || key.wheelDown) return false;
  const isNav = key.leftArrow || key.rightArrow || key.upArrow || key.downArrow || key.home || key.end || key.pageUp || key.pageDown;
  if (isNav && (key.shift || key.meta || key.super)) return false;
  return true;
}

/**
 * Map a keypress to a selection focus move (keyboard extension). Only
 * shift extends β€” that's the universal text-selection modifier. cmd
 * (super) only arrives via kitty keyboard protocol β€” in most terminals
 * cmd+arrow is intercepted by the emulator and never reaches the pty, so
 * no super branch. shift+home/end covers line-edge jumps (and fn+shift+
 * left/right on mac laptops = shift+home/end). shift+opt (word-jump) not
 * yet implemented β€” falls through to shouldClearSelectionOnKey which
 * preserves (modified nav). Returns null for non-extend keys.
 */
export function selectionFocusMoveForKey(key: Key): FocusMove | null {
  if (!key.shift || key.meta) return null;
  if (key.leftArrow) return 'left';
  if (key.rightArrow) return 'right';
  if (key.upArrow) return 'up';
  if (key.downArrow) return 'down';
  if (key.home) return 'lineStart';
  if (key.end) return 'lineEnd';
  return null;
}
export type WheelAccelState = {
  time: number;
  mult: number;
  dir: 0 | 1 | -1;
  xtermJs: boolean;
  /** Carried fractional scroll (xterm.js only). scrollBy floors, so without
   *  this a mult of 1.5 gives 1 row every time. Carrying the remainder gives
   *  1,2,1,2 on average for mult=1.5 β€” correct throughput over time. */
  frac: number;
  /** Native-path baseline rows/event. Reset value on idle/reversal; ramp
   *  builds on top. xterm.js path ignores this (own kick=2 tuning). */
  base: number;
  /** Deferred direction flip (native only). Might be encoder bounce or a
   *  real reversal β€” resolved by the NEXT event. Real reversal loses 1 row
   *  of latency; bounce is swallowed and triggers wheel mode. The flip's
   *  direction and timestamp are derivable (it's always -state.dir at
   *  state.time) so this is just a marker. */
  pendingFlip: boolean;
  /** Set true once a bounce is confirmed (flip-then-flip-back within
   *  BOUNCE_GAP_MAX). Sticky β€” but disengaged on idle gap >1500ms OR a
   *  trackpad-signature burst (see burstCount). State lives in a useRef so
   *  it persists across device switches; the disengages handle mouse→trackpad. */
  wheelMode: boolean;
  /** Consecutive <5ms events. Trackpad flick produces 100+ at <5ms; mouse
   *  produces ≀3 (verified in /tmp/wheel-tune.txt). 5+ in a row β†’ trackpad
   *  signature β†’ disengage wheel mode so device-switch doesn't leak mouse
   *  accel to trackpad. */
  burstCount: number;
};

/** Compute rows for one wheel event, mutating accel state. Returns 0 when
 *  a direction flip is deferred for bounce detection β€” call sites no-op on
 *  step=0 (scrollBy(0) is a no-op, onScroll(false) is idempotent). Exported
 *  for tests. */
export function computeWheelStep(state: WheelAccelState, dir: 1 | -1, now: number): number {
  if (!state.xtermJs) {
    // Device-switch guard β‘ : idle disengage. Runs BEFORE pendingFlip resolve
    // so a pending bounce (28% of last-mouse-events) doesn't bypass it via
    // the real-reversal early return. state.time is either the last committed
    // event OR the deferred flip β€” both count as "last activity".
    if (state.wheelMode && now - state.time > WHEEL_MODE_IDLE_DISENGAGE_MS) {
      state.wheelMode = false;
      state.burstCount = 0;
      state.mult = state.base;
    }

    // Resolve any deferred flip BEFORE touching state.time/dir β€” we need the
    // pre-flip state.dir to distinguish bounce (flip-back) from real reversal
    // (flip persisted), and state.time (= bounce timestamp) for the gap check.
    if (state.pendingFlip) {
      state.pendingFlip = false;
      if (dir !== state.dir || now - state.time > WHEEL_BOUNCE_GAP_MAX_MS) {
        // Real reversal: new dir persisted, OR flip-back arrived too late.
        // Commit. The deferred event's 1 row is lost (acceptable latency).
        state.dir = dir;
        state.time = now;
        state.mult = state.base;
        return Math.floor(state.mult);
      }
      // Bounce confirmed: flipped back to original dir within the window.
      // state.dir/mult unchanged from pre-bounce. state.time was advanced to
      // the bounce below, so gap here = flip-back interval β€” reflects the
      // user's actual click cadence (bounce IS a physical click, just noisy).
      state.wheelMode = true;
    }
    const gap = now - state.time;
    if (dir !== state.dir && state.dir !== 0) {
      // Flip. Defer β€” next event decides bounce vs. real reversal. Advance
      // time (but NOT dir/mult): if this turns out to be a bounce, the
      // confirm event's gap will be the flip-back interval, which reflects
      // the user's actual click rate. The bounce IS a physical wheel click,
      // just misread by the encoder β€” it should count toward cadence.
      state.pendingFlip = true;
      state.time = now;
      return 0;
    }
    state.dir = dir;
    state.time = now;

    // ─── MOUSE (wheel mode, sticky until device-switch signal) ───
    if (state.wheelMode) {
      if (gap < WHEEL_BURST_MS) {
        // Same-batch burst check (ported from xterm.js): iTerm2 proportional
        // reporting sends 2+ SGR events for one detent when macOS gives
        // delta>1. Without this, the 2nd event at gap<1ms has mβ‰ˆ1 β†’ STEP*m=15
        // β†’ one gentle click gives 1+15=16 rows.
        //
        // Device-switch guard β‘‘: trackpad flick produces 100+ events at <5ms
        // (measured); mouse produces ≀3. 5+ consecutive β†’ trackpad flick.
        if (++state.burstCount >= 5) {
          state.wheelMode = false;
          state.burstCount = 0;
          state.mult = state.base;
        } else {
          return 1;
        }
      } else {
        state.burstCount = 0;
      }
    }
    // Re-check: may have disengaged above.
    if (state.wheelMode) {
      // xterm.js decay curve with STEPΓ—3, higher cap. No idle threshold β€”
      // the curve handles it (gap=1000ms β†’ mβ‰ˆ0.01 β†’ multβ‰ˆ1). No frac β€”
      // rounding loss is minor at high mult, and frac persisting across idle
      // was causing off-by-one on the first click back.
      const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS);
      const cap = Math.max(WHEEL_MODE_CAP, state.base * 2);
      const next = 1 + (state.mult - 1) * m + WHEEL_MODE_STEP * m;
      state.mult = Math.min(cap, next, state.mult + WHEEL_MODE_RAMP);
      return Math.floor(state.mult);
    }

    // ─── TRACKPAD / HI-RES (native, non-wheel-mode) ───
    // Tight 40ms burst window: sub-40ms events ramp, anything slower resets.
    // Trackpad flick delivers 200+ events at <20ms gaps β†’ rails to cap 6.
    // Trackpad slow swipe at 40-400ms gaps β†’ resets every event β†’ 1 row each.
    if (gap > WHEEL_ACCEL_WINDOW_MS) {
      state.mult = state.base;
    } else {
      const cap = Math.max(WHEEL_ACCEL_MAX, state.base * 2);
      state.mult = Math.min(cap, state.mult + WHEEL_ACCEL_STEP);
    }
    return Math.floor(state.mult);
  }

  // ─── VSCODE (xterm.js, browser wheel events) ───
  // Browser wheel events β€” no encoder bounce, no SGR bursts. Decay curve
  // unchanged from the original tuning. Same formula shape as wheel mode
  // above (keep in sync) but STEP=5 not 15 β€” higher event rate here.
  const gap = now - state.time;
  const sameDir = dir === state.dir;
  state.time = now;
  state.dir = dir;
  // xterm.js path. Debug log shows two patterns: (a) 20-50ms gaps during
  // sustained scroll (~30 Hz), (b) <5ms same-batch bursts on flicks. For
  // (b) give 1 row/event β€” the burst count IS the acceleration, same as
  // native. For (a) the decay curve gives 3-5 rows. For sparse events
  // (100ms+, slow deliberate scroll) the curve gives 1-3.
  if (sameDir && gap < WHEEL_BURST_MS) return 1;
  if (!sameDir || gap > WHEEL_DECAY_IDLE_MS) {
    // Direction reversal or long idle: start at 2 (not 1) so the first
    // click after a pause moves a visible amount. Without this, idle-
    // then-resume in the same direction decays to multβ‰ˆ1 (1 row).
    state.mult = 2;
    state.frac = 0;
  } else {
    const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS);
    const cap = gap >= WHEEL_DECAY_GAP_MS ? WHEEL_DECAY_CAP_SLOW : WHEEL_DECAY_CAP_FAST;
    state.mult = Math.min(cap, 1 + (state.mult - 1) * m + WHEEL_DECAY_STEP * m);
  }
  const total = state.mult + state.frac;
  const rows = Math.floor(total);
  state.frac = total - rows;
  return rows;
}

/** Read CLAUDE_CODE_SCROLL_SPEED, default 1, clamp (0, 20].
 *  Some terminals pre-multiply wheel events (ghostty discrete=3, iTerm2
 *  "faster scroll") β€” base=1 is correct there. Others send 1 event/notch β€”
 *  set CLAUDE_CODE_SCROLL_SPEED=3 to match vim/nvim/opencode. We can't
 *  detect which kind of terminal we're in, hence the knob. Called lazily
 *  from initAndLogWheelAccel so globalSettings.env has loaded. */
export function readScrollSpeedBase(): number {
  const raw = process.env.CLAUDE_CODE_SCROLL_SPEED;
  if (!raw) return 1;
  const n = parseFloat(raw);
  return Number.isNaN(n) || n <= 0 ? 1 : Math.min(n, 20);
}

/** Initial wheel accel state. xtermJs=true selects the decay curve.
 *  base is the native-path baseline rows/event (default 1). */
export function initWheelAccel(xtermJs = false, base = 1): WheelAccelState {
  return {
    time: 0,
    mult: base,
    dir: 0,
    xtermJs,
    frac: 0,
    base,
    pendingFlip: false,
    wheelMode: false,
    burstCount: 0
  };
}

// Lazy-init helper. isXtermJs() combines the TERM_PROGRAM env check + async
// XTVERSION probe β€” the probe may not have resolved at render time, so this
// is called on the first wheel event (>>50ms after startup) when it's settled.
// Logs detected mode once so --debug users can verify SSH detection worked.
// The renderer also calls isXtermJsHost() (in render-node-to-output) to
// select the drain algorithm β€” no state to pass through.
function initAndLogWheelAccel(): WheelAccelState {
  const xtermJs = isXtermJs();
  const base = readScrollSpeedBase();
  logForDebugging(`wheel accel: ${xtermJs ? 'decay (xterm.js)' : 'window (native)'} Β· base=${base} Β· TERM_PROGRAM=${process.env.TERM_PROGRAM ?? 'unset'}`);
  return initWheelAccel(xtermJs, base);
}

// Drag-to-scroll: when dragging past the viewport edge, scroll by this many
// rows every AUTOSCROLL_INTERVAL_MS. Mode 1002 mouse tracking only fires on
// cell change, so a timer is needed to continue scrolling while stationary.
const AUTOSCROLL_LINES = 2;
const AUTOSCROLL_INTERVAL_MS = 50;
// Hard cap on consecutive auto-scroll ticks. If the release event is lost
// (mouse released outside terminal window β€” some emulators don't capture the
// pointer and drop the release), isDragging stays true and the timer would
// run until a scroll boundary. Cap bounds the damage; any new drag motion
// event restarts the count via check()β†’start().
const AUTOSCROLL_MAX_TICKS = 200; // 10s @ 50ms

/**
 * Keyboard scroll navigation for the fullscreen layout's message scroll box.
 * PgUp/PgDn scroll by half-viewport. Mouse wheel scrolls by a few lines.
 * Scrolling breaks sticky mode; Ctrl+End re-enables it. Wheeling down at
 * the bottom also re-enables sticky so new content follows naturally.
 */
export function ScrollKeybindingHandler({
  scrollRef,
  isActive,
  onScroll,
  isModal = false
}: Props): React.ReactNode {
  const selection = useSelection();
  const {
    addNotification
  } = useNotifications();
  // Lazy-inited on first wheel event so the XTVERSION probe (fired at
  // raw-mode-enable time) has resolved by then β€” initializing in useRef()
  // would read getWheelBase() before the probe reply arrives over SSH.
  const wheelAccel = useRef<WheelAccelState | null>(null);
  function showCopiedToast(text: string): void {
    // getClipboardPath reads env synchronously β€” predicts what setClipboard
    // did (native pbcopy / tmux load-buffer / raw OSC 52) so we can tell
    // the user whether paste will Just Work or needs prefix+].
    const path = getClipboardPath();
    const n = text.length;
    let msg: string;
    switch (path) {
      case 'native':
        msg = `copied ${n} chars to clipboard`;
        break;
      case 'tmux-buffer':
        msg = `copied ${n} chars to tmux buffer Β· paste with prefix + ]`;
        break;
      case 'osc52':
        msg = `sent ${n} chars via OSC 52 Β· check terminal clipboard settings if paste fails`;
        break;
    }
    addNotification({
      key: 'selection-copied',
      text: msg,
      color: 'suggestion',
      priority: 'immediate',
      timeoutMs: path === 'native' ? 2000 : 4000
    });
  }
  function copyAndToast(): void {
    const text_0 = selection.copySelection();
    if (text_0) showCopiedToast(text_0);
  }

  // Translate selection to track a keyboard page jump. Selection coords are
  // screen-buffer-local; a scrollTo that moves content by N rows must also
  // shift anchor+focus by N so the highlight stays on the same text (native
  // terminal behavior: selection moves with content, clips at viewport
  // edges). Rows that scroll out of the viewport are captured into
  // scrolledOffAbove/Below before the scroll so getSelectedText still
  // returns the full text. Wheel scroll (scroll:lineUp/Down via scrollBy)
  // still clears β€” its async pendingScrollDelta drain means the actual
  // delta isn't known synchronously (follow-up).
  function translateSelectionForJump(s: ScrollBoxHandle, delta: number): void {
    const sel = selection.getState();
    if (!sel?.anchor || !sel.focus) return;
    const top = s.getViewportTop();
    const bottom = top + s.getViewportHeight() - 1;
    // Only translate if the selection is ON scrollbox content. Selections
    // in the footer/prompt/StickyPromptHeader are on static text β€” the
    // scroll doesn't move what's under them. Same guard as ink.tsx's
    // auto-follow translate (commit 36a8d154).
    if (sel.anchor.row < top || sel.anchor.row > bottom) return;
    // Cross-boundary: anchor in scrollbox, focus in footer/header. Mirror
    // ink.tsx's Flag-3 guard β€” fall through without shifting OR capturing.
    // The static endpoint pins the selection; shifting would teleport it
    // into scrollbox content.
    if (sel.focus.row < top || sel.focus.row > bottom) return;
    const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight());
    const cur = s.getScrollTop() + s.getPendingDelta();
    // Actual scroll distance after boundary clamp. jumpBy may call
    // scrollToBottom when target >= max but the view can't move past max,
    // so the selection shift is bounded here.
    const actual = Math.max(0, Math.min(max, cur + delta)) - cur;
    if (actual === 0) return;
    if (actual > 0) {
      // Scrolling down: content moves up. Rows at the TOP leave viewport.
      // Anchor+focus shift -actual so they track the content that moved up.
      selection.captureScrolledRows(top, top + actual - 1, 'above');
      selection.shiftSelection(-actual, top, bottom);
    } else {
      // Scrolling up: content moves down. Rows at the BOTTOM leave viewport.
      const a = -actual;
      selection.captureScrolledRows(bottom - a + 1, bottom, 'below');
      selection.shiftSelection(a, top, bottom);
    }
  }
  useKeybindings({
    'scroll:pageUp': () => {
      const s_0 = scrollRef.current;
      if (!s_0) return;
      const d = -Math.max(1, Math.floor(s_0.getViewportHeight() / 2));
      translateSelectionForJump(s_0, d);
      const sticky = jumpBy(s_0, d);
      onScroll?.(sticky, s_0);
    },
    'scroll:pageDown': () => {
      const s_1 = scrollRef.current;
      if (!s_1) return;
      const d_0 = Math.max(1, Math.floor(s_1.getViewportHeight() / 2));
      translateSelectionForJump(s_1, d_0);
      const sticky_0 = jumpBy(s_1, d_0);
      onScroll?.(sticky_0, s_1);
    },
    'scroll:lineUp': () => {
      // Wheel: scrollBy accumulates into pendingScrollDelta, drained async
      // by the renderer. captureScrolledRows can't read the outgoing rows
      // before they leave (drain is non-deterministic). Clear for now.
      selection.clearSelection();
      const s_2 = scrollRef.current;
      // Return false (not consumed) when the ScrollBox content fits β€”
      // scroll would be a no-op. Lets a child component's handler take
      // the wheel event instead (e.g. Settings Config's list navigation
      // inside the centered Modal, where the paginated slice always fits).
      if (!s_2 || s_2.getScrollHeight() <= s_2.getViewportHeight()) return false;
      wheelAccel.current ??= initAndLogWheelAccel();
      scrollUp(s_2, computeWheelStep(wheelAccel.current, -1, performance.now()));
      onScroll?.(false, s_2);
    },
    'scroll:lineDown': () => {
      selection.clearSelection();
      const s_3 = scrollRef.current;
      if (!s_3 || s_3.getScrollHeight() <= s_3.getViewportHeight()) return false;
      wheelAccel.current ??= initAndLogWheelAccel();
      const step = computeWheelStep(wheelAccel.current, 1, performance.now());
      const reachedBottom = scrollDown(s_3, step);
      onScroll?.(reachedBottom, s_3);
    },
    'scroll:top': () => {
      const s_4 = scrollRef.current;
      if (!s_4) return;
      translateSelectionForJump(s_4, -(s_4.getScrollTop() + s_4.getPendingDelta()));
      s_4.scrollTo(0);
      onScroll?.(false, s_4);
    },
    'scroll:bottom': () => {
      const s_5 = scrollRef.current;
      if (!s_5) return;
      const max_0 = Math.max(0, s_5.getScrollHeight() - s_5.getViewportHeight());
      translateSelectionForJump(s_5, max_0 - (s_5.getScrollTop() + s_5.getPendingDelta()));
      // scrollTo(max) eager-writes scrollTop so the render-phase sticky
      // follow computes followDelta=0. Without this, scrollToBottom()
      // alone leaves scrollTop stale β†’ followDelta=max-stale β†’
      // shiftSelectionForFollow applies the SAME shift we already did
      // above, 2Γ— offset. scrollToBottom() then re-enables sticky.
      s_5.scrollTo(max_0);
      s_5.scrollToBottom();
      onScroll?.(true, s_5);
    },
    'selection:copy': copyAndToast
  }, {
    context: 'Scroll',
    isActive
  });

  // scroll:halfPage*/fullPage* have no default key bindings β€” ctrl+u/d/b/f
  // all have real owners in normal mode (kill-line/exit/task:background/
  // kill-agents). Transcript mode gets them via the isModal raw useInput
  // below. These handlers stay for custom rebinds only.
  useKeybindings({
    'scroll:halfPageUp': () => {
      const s_6 = scrollRef.current;
      if (!s_6) return;
      const d_1 = -Math.max(1, Math.floor(s_6.getViewportHeight() / 2));
      translateSelectionForJump(s_6, d_1);
      const sticky_1 = jumpBy(s_6, d_1);
      onScroll?.(sticky_1, s_6);
    },
    'scroll:halfPageDown': () => {
      const s_7 = scrollRef.current;
      if (!s_7) return;
      const d_2 = Math.max(1, Math.floor(s_7.getViewportHeight() / 2));
      translateSelectionForJump(s_7, d_2);
      const sticky_2 = jumpBy(s_7, d_2);
      onScroll?.(sticky_2, s_7);
    },
    'scroll:fullPageUp': () => {
      const s_8 = scrollRef.current;
      if (!s_8) return;
      const d_3 = -Math.max(1, s_8.getViewportHeight());
      translateSelectionForJump(s_8, d_3);
      const sticky_3 = jumpBy(s_8, d_3);
      onScroll?.(sticky_3, s_8);
    },
    'scroll:fullPageDown': () => {
      const s_9 = scrollRef.current;
      if (!s_9) return;
      const d_4 = Math.max(1, s_9.getViewportHeight());
      translateSelectionForJump(s_9, d_4);
      const sticky_4 = jumpBy(s_9, d_4);
      onScroll?.(sticky_4, s_9);
    }
  }, {
    context: 'Scroll',
    isActive
  });

  // Modal pager keys β€” transcript mode only. less/tmux copy-mode lineage:
  // ctrl+u/d (half-page), ctrl+b/f (full-page), g/G (top/bottom). Tom's
  // resolution (2026-03-15): "In ctrl-o mode, ctrl-u, ctrl-d, etc. should
  // roughly just work!" β€” transcript is the copy-mode container.
  //
  // Safe because the conflicting handlers aren't reachable here:
  //   ctrl+u β†’ kill-line, ctrl+d β†’ exit: PromptInput not mounted
  //   ctrl+b β†’ task:background: SessionBackgroundHint not mounted
  //   ctrl+f β†’ chat:killAgents moved to ctrl+x ctrl+k; no conflict
  //   g/G β†’ printable chars: no prompt to eat them, no vim/sticky gate needed
  //
  // TODO(search): `/`, n/N β€” build on Richard Kim's d94b07add4 (branch
  // claude/jump-recent-message-CEPcq). getItemY Yoga-walk + computeOrigin +
  // anchorY already solve scroll-to-index. jumpToPrevTurn is the n/N
  // template. Single-shot via OVERSCAN_ROWS=80; two-phase was tried and
  // abandoned (❯ oscillation). See team memory scroll-copy-mode-design.md.
  useInput((input, key, event) => {
    const s_10 = scrollRef.current;
    if (!s_10) return;
    const sticky_5 = applyModalPagerAction(s_10, modalPagerAction(input, key), d_5 => translateSelectionForJump(s_10, d_5));
    if (sticky_5 === null) return;
    onScroll?.(sticky_5, s_10);
    event.stopImmediatePropagation();
  }, {
    isActive: isActive && isModal
  });

  // Esc clears selection; any other keystroke also clears it (matches
  // native terminal behavior where selection disappears on input).
  // Ctrl+C copies when a selection exists β€” needed on legacy terminals
  // where ctrl+shift+c sends the same byte (\x03, shift is lost) and
  // cmd+c never reaches the pty (terminal intercepts it for Edit > Copy).
  // Handled via raw useInput so we can conditionally consume: Esc/Ctrl+C
  // only stop propagation when a selection exists, letting them still work
  // for cancel-request / interrupt otherwise. Other keys never stop
  // propagation β€” they're observed to clear selection as a side-effect.
  // The selection:copy keybinding (ctrl+shift+c / cmd+c) registers above
  // via useKeybindings and consumes its event before reaching here.
  useInput((input_0, key_0, event_0) => {
    if (!selection.hasSelection()) return;
    if (key_0.escape) {
      selection.clearSelection();
      event_0.stopImmediatePropagation();
      return;
    }
    if (key_0.ctrl && !key_0.shift && !key_0.meta && input_0 === 'c') {
      copyAndToast();
      event_0.stopImmediatePropagation();
      return;
    }
    const move = selectionFocusMoveForKey(key_0);
    if (move) {
      selection.moveFocus(move);
      event_0.stopImmediatePropagation();
      return;
    }
    if (shouldClearSelectionOnKey(key_0)) {
      selection.clearSelection();
    }
  }, {
    isActive
  });
  useDragToScroll(scrollRef, selection, isActive, onScroll);
  useCopyOnSelect(selection, isActive, showCopiedToast);
  useSelectionBgColor(selection);
  return null;
}

/**
 * Auto-scroll the ScrollBox when the user drags a selection past its top or
 * bottom edge. The anchor is shifted in the opposite direction so it stays
 * on the same content (content that was at viewport row N is now at row NΒ±d
 * after scrolling by d). Focus stays at the mouse position (edge row).
 *
 * Selection coords are screen-buffer-local, so the anchor is clamped to the
 * viewport bounds once the original content scrolls out. To preserve the full
 * selection, rows about to scroll out are captured into scrolledOffAbove/
 * scrolledOffBelow before each scroll step and joined back in by
 * getSelectedText.
 */
function useDragToScroll(scrollRef: RefObject<ScrollBoxHandle | null>, selection: ReturnType<typeof useSelection>, isActive: boolean, onScroll: Props['onScroll']): void {
  const timerRef = useRef<NodeJS.Timeout | null>(null);
  const dirRef = useRef<-1 | 0 | 1>(0); // -1 scrolling up, +1 down, 0 idle
  // Survives stop() β€” reset only on drag-finish. See check() for semantics.
  const lastScrolledDirRef = useRef<-1 | 0 | 1>(0);
  const ticksRef = useRef(0);
  // onScroll may change identity every render (if not memoized by caller).
  // Read through a ref so the effect doesn't re-subscribe and kill the timer
  // on each scroll-induced re-render.
  const onScrollRef = useRef(onScroll);
  onScrollRef.current = onScroll;
  useEffect(() => {
    if (!isActive) return;
    function stop(): void {
      dirRef.current = 0;
      if (timerRef.current) {
        clearInterval(timerRef.current);
        timerRef.current = null;
      }
    }
    function tick(): void {
      const sel = selection.getState();
      const s = scrollRef.current;
      const dir = dirRef.current;
      // dir === 0 defends against a stale interval (start() may have set one
      // after the immediate tick already called stop() at a scroll boundary).
      // ticks cap defends against a lost release event (mouse released
      // outside terminal window) leaving isDragging stuck true.
      if (!sel?.isDragging || !sel.focus || !s || dir === 0 || ++ticksRef.current > AUTOSCROLL_MAX_TICKS) {
        stop();
        return;
      }
      // scrollBy accumulates into pendingScrollDelta; the screen buffer
      // doesn't update until the next render drains it. If a previous
      // tick's scroll hasn't drained yet, captureScrolledRows would read
      // stale content (same rows as last tick β†’ duplicated in the
      // accumulator AND missing the rows that actually scrolled out).
      // Skip this tick; the 50ms interval will retry after Ink's 16ms
      // render catches up. Also prevents shiftAnchor from desyncing.
      if (s.getPendingDelta() !== 0) return;
      const top = s.getViewportTop();
      const bottom = top + s.getViewportHeight() - 1;
      // Clamp anchor within [top, bottom]. Not [0, bottom]: the ScrollBox
      // padding row at 0 would produce a blank line between scrolledOffAbove
      // and the on-screen content in getSelectedText. The padding-row
      // highlight was a minor visual nicety; text correctness wins.
      if (dir < 0) {
        if (s.getScrollTop() <= 0) {
          stop();
          return;
        }
        // Scrolling up: content moves down in viewport, so anchor row +N.
        // Clamp to actual scroll distance so anchor stays in sync when near
        // the top boundary (renderer clamps scrollTop to 0 on drain).
        const actual = Math.min(AUTOSCROLL_LINES, s.getScrollTop());
        // Capture rows about to scroll out the BOTTOM before scrollBy
        // overwrites them. Only rows inside the selection are captured
        // (captureScrolledRows intersects with selection bounds).
        selection.captureScrolledRows(bottom - actual + 1, bottom, 'below');
        selection.shiftAnchor(actual, 0, bottom);
        s.scrollBy(-AUTOSCROLL_LINES);
      } else {
        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight());
        if (s.getScrollTop() >= max) {
          stop();
          return;
        }
        // Scrolling down: content moves up in viewport, so anchor row -N.
        // Clamp to actual scroll distance so anchor stays in sync when near
        // the bottom boundary (renderer clamps scrollTop to max on drain).
        const actual_0 = Math.min(AUTOSCROLL_LINES, max - s.getScrollTop());
        // Capture rows about to scroll out the TOP.
        selection.captureScrolledRows(top, top + actual_0 - 1, 'above');
        selection.shiftAnchor(-actual_0, top, bottom);
        s.scrollBy(AUTOSCROLL_LINES);
      }
      onScrollRef.current?.(false, s);
    }
    function start(dir_0: -1 | 1): void {
      // Record BEFORE early-return: the empty-accumulator reset in check()
      // may have zeroed this during the pre-crossing phase (accumulators
      // empty until the anchor row enters the capture range). Re-record
      // on every call so the corruption is instantly healed.
      lastScrolledDirRef.current = dir_0;
      if (dirRef.current === dir_0) return; // already going this way
      stop();
      dirRef.current = dir_0;
      ticksRef.current = 0;
      tick();
      // tick() may have hit a scroll boundary and called stop() (dir reset to
      // 0). Only start the interval if we're still going β€” otherwise the
      // interval would run forever with dir === 0 doing nothing useful.
      if (dirRef.current === dir_0) {
        timerRef.current = setInterval(tick, AUTOSCROLL_INTERVAL_MS);
      }
    }

    // Re-evaluated on every selection change (start/drag/finish/clear).
    // Drives drag-to-scroll autoscroll when the drag leaves the viewport.
    // Prior versions broke sticky here on drag-start to prevent selection
    // drift during streaming β€” ink.tsx now translates selection coords by
    // the follow delta instead (native terminal behavior: view keeps
    // scrolling, highlight walks up with the text). Keeping sticky also
    // avoids useVirtualScroll's tail-walk β†’ forward-walk phantom growth.
    function check(): void {
      const s_0 = scrollRef.current;
      if (!s_0) {
        stop();
        return;
      }
      const top_0 = s_0.getViewportTop();
      const bottom_0 = top_0 + s_0.getViewportHeight() - 1;
      const sel_0 = selection.getState();
      // Pass the LAST-scrolled direction (not dirRef) so the anchor guard is
      // bypassed after shiftAnchor has clamped anchor toward row 0. Using
      // lastScrolledDirRef (survives stop()) lets autoscroll resume after a
      // brief mouse dip into the viewport. Same-direction only β€” a mouse
      // jump from below-bottom to above-top must stop, since reversing while
      // the scrolledOffAbove/Below accumulators hold the prior direction's
      // rows would duplicate text in getSelectedText. Reset on drag-finish
      // OR when both accumulators are empty: startSelection clears them
      // (selection.ts), so a new drag after a lost-release (isDragging
      // stuck true, the reason AUTOSCROLL_MAX_TICKS exists) still resets.
      // Safe: start() below re-records lastScrolledDirRef before its
      // early-return, so a mid-scroll reset here is instantly undone.
      if (!sel_0?.isDragging || sel_0.scrolledOffAbove.length === 0 && sel_0.scrolledOffBelow.length === 0) {
        lastScrolledDirRef.current = 0;
      }
      const dir_1 = dragScrollDirection(sel_0, top_0, bottom_0, lastScrolledDirRef.current);
      if (dir_1 === 0) {
        // Blocked reversal: focus jumped to the opposite edge (off-window
        // drag return, fast flick). handleSelectionDrag already moved focus
        // past the anchor, flipping selectionBounds β€” the accumulator is
        // now orphaned (holds rows on the wrong side). Clear it so
        // getSelectedText matches the visible highlight.
        if (lastScrolledDirRef.current !== 0 && sel_0?.focus) {
          const want = sel_0.focus.row < top_0 ? -1 : sel_0.focus.row > bottom_0 ? 1 : 0;
          if (want !== 0 && want !== lastScrolledDirRef.current) {
            sel_0.scrolledOffAbove = [];
            sel_0.scrolledOffBelow = [];
            sel_0.scrolledOffAboveSW = [];
            sel_0.scrolledOffBelowSW = [];
            lastScrolledDirRef.current = 0;
          }
        }
        stop();
      } else start(dir_1);
    }
    const unsubscribe = selection.subscribe(check);
    return () => {
      unsubscribe();
      stop();
      lastScrolledDirRef.current = 0;
    };
  }, [isActive, scrollRef, selection]);
}

/**
 * Compute autoscroll direction for a drag selection relative to the ScrollBox
 * viewport. Returns 0 when not dragging, anchor/focus missing, or the anchor
 * is outside the viewport β€” a multi-click or drag that started in the input
 * area must not commandeer the message scroll (double-click in the input area
 * while scrolled up previously corrupted the anchor via shiftAnchor and
 * spuriously scrolled the message history every 50ms until release).
 *
 * alreadyScrollingDir bypasses the anchor-in-viewport guard once autoscroll
 * is active (shiftAnchor legitimately clamps the anchor toward row 0, below
 * `top`) but only allows SAME-direction continuation. If the focus jumps to
 * the opposite edge (below→above or above→below — possible with a fast flick
 * or off-window drag since mode 1002 reports on cell change, not per cell),
 * returns 0 to stop β€” reversing without clearing scrolledOffAbove/Below
 * would duplicate captured rows when they scroll back on-screen.
 */
export function dragScrollDirection(sel: SelectionState | null, top: number, bottom: number, alreadyScrollingDir: -1 | 0 | 1 = 0): -1 | 0 | 1 {
  if (!sel?.isDragging || !sel.anchor || !sel.focus) return 0;
  const row = sel.focus.row;
  const want: -1 | 0 | 1 = row < top ? -1 : row > bottom ? 1 : 0;
  if (alreadyScrollingDir !== 0) {
    // Same-direction only. Focus on the opposite side, or back inside the
    // viewport, stops the scroll β€” captured rows stay in scrolledOffAbove/
    // Below but never scroll back on-screen, so getSelectedText is correct.
    return want === alreadyScrollingDir ? want : 0;
  }
  // Anchor must be inside the viewport for us to own this drag. If the
  // user started selecting in the input box or header, autoscrolling the
  // message history is surprising and corrupts the anchor via shiftAnchor.
  if (sel.anchor.row < top || sel.anchor.row > bottom) return 0;
  return want;
}

// Keyboard page jumps: scrollTo() writes scrollTop directly and clears
// pendingScrollDelta β€” one frame, no drain. scrollBy() accumulates into
// pendingScrollDelta which the renderer drains over several frames
// (render-node-to-output.ts drainProportional/drainAdaptive) β€” correct for
// wheel smoothness, wrong for PgUp/ctrl+u where the user expects a snap.
// Target is relative to scrollTop+pendingDelta so a jump mid-wheel-burst
// lands where the wheel was heading.
export function jumpBy(s: ScrollBoxHandle, delta: number): boolean {
  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight());
  const target = s.getScrollTop() + s.getPendingDelta() + delta;
  if (target >= max) {
    // Eager-write scrollTop so follow-scroll sees followDelta=0. Callers
    // that ran translateSelectionForJump already shifted; scrollToBottom()
    // alone would double-shift via the render-phase sticky follow.
    s.scrollTo(max);
    s.scrollToBottom();
    return true;
  }
  s.scrollTo(Math.max(0, target));
  return false;
}

// Wheel-down past maxScroll re-enables sticky so wheeling at the bottom
// naturally re-pins (matches typical chat-app behavior). Returns the
// resulting sticky state so callers can propagate it.
function scrollDown(s: ScrollBoxHandle, amount: number): boolean {
  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight());
  // Include pendingDelta: scrollBy accumulates into pendingScrollDelta
  // without updating scrollTop, so getScrollTop() alone is stale within
  // a batch of wheel events. Without this, wheeling to the bottom never
  // re-enables sticky scroll.
  const effectiveTop = s.getScrollTop() + s.getPendingDelta();
  if (effectiveTop + amount >= max) {
    s.scrollToBottom();
    return true;
  }
  s.scrollBy(amount);
  return false;
}

// Wheel-up past scrollTop=0 clamps via scrollTo(0), clearing
// pendingScrollDelta so aggressive wheel bursts (e.g. MX Master free-spin)
// don't accumulate an unbounded negative delta. Without this clamp,
// useVirtualScroll's [effLo, effHi] span grows past what MAX_MOUNTED_ITEMS
// can cover and intermediate drain frames render at scrollTops with no
// mounted children β€” blank viewport.
export function scrollUp(s: ScrollBoxHandle, amount: number): void {
  // Include pendingDelta: scrollBy accumulates without updating scrollTop,
  // so getScrollTop() alone is stale within a batch of wheel events.
  const effectiveTop = s.getScrollTop() + s.getPendingDelta();
  if (effectiveTop - amount <= 0) {
    s.scrollTo(0);
    return;
  }
  s.scrollBy(-amount);
}
export type ModalPagerAction = 'lineUp' | 'lineDown' | 'halfPageUp' | 'halfPageDown' | 'fullPageUp' | 'fullPageDown' | 'top' | 'bottom';

/**
 * Maps a keystroke to a modal pager action. Exported for testing.
 * Returns null for keys the modal pager doesn't handle (they fall through).
 *
 * ctrl+u/d/b/f are the less-lineage bindings. g/G are bare letters (only
 * safe when no prompt is mounted). G arrives as input='G' shift=false on
 * legacy terminals, or input='g' shift=true on kitty-protocol terminals.
 * Lowercase g needs the !shift guard so it doesn't also match kitty-G.
 *
 * Key-repeat: stdin coalesces held-down printables into one multi-char
 * string (e.g. 'ggg'). Only uniform-char batches are handled β€” mixed input
 * like 'gG' isn't key-repeat. g/G are idempotent absolute jumps, so the
 * count is irrelevant (consuming the batch just prevents it from leaking
 * to the selection-clear-on-printable handler).
 */
export function modalPagerAction(input: string, key: Pick<Key, 'ctrl' | 'meta' | 'shift' | 'upArrow' | 'downArrow' | 'home' | 'end'>): ModalPagerAction | null {
  if (key.meta) return null;
  // Special keys first β€” arrows/home/end arrive with empty or junk input,
  // so these must be checked before any input-string logic. shift is
  // reserved for selection-extend (selectionFocusMoveForKey); ctrl+home/end
  // already has a useKeybindings route to scroll:top/bottom.
  if (!key.ctrl && !key.shift) {
    if (key.upArrow) return 'lineUp';
    if (key.downArrow) return 'lineDown';
    if (key.home) return 'top';
    if (key.end) return 'bottom';
  }
  if (key.ctrl) {
    if (key.shift) return null;
    switch (input) {
      case 'u':
        return 'halfPageUp';
      case 'd':
        return 'halfPageDown';
      case 'b':
        return 'fullPageUp';
      case 'f':
        return 'fullPageDown';
      // emacs-style line scroll (less accepts both ctrl+n/p and ctrl+e/y).
      // Works during search nav β€” fine-adjust after a jump without
      // leaving modal. No !searchOpen gate on this useInput's isActive.
      case 'n':
        return 'lineDown';
      case 'p':
        return 'lineUp';
      default:
        return null;
    }
  }
  // Bare letters. Key-repeat batches: only act on uniform runs.
  const c = input[0];
  if (!c || input !== c.repeat(input.length)) return null;
  // kitty sends G as input='g' shift=true; legacy as 'G' shift=false.
  // Check BEFORE the shift-gate so both hit 'bottom'.
  if (c === 'G' || c === 'g' && key.shift) return 'bottom';
  if (key.shift) return null;
  switch (c) {
    case 'g':
      return 'top';
    // j/k re-added per Tom Mar 18 β€” reversal of Mar 16 removal. Works
    // during search nav (fine-adjust after n/N lands) since isModal is
    // independent of searchOpen.
    case 'j':
      return 'lineDown';
    case 'k':
      return 'lineUp';
    // less: space = page down, b = page up. ctrl+b already maps above;
    // bare b is the less-native version.
    case ' ':
      return 'fullPageDown';
    case 'b':
      return 'fullPageUp';
    default:
      return null;
  }
}

/**
 * Applies a modal pager action to a ScrollBox. Returns the resulting sticky
 * state, or null if the action was null (nothing to do β€” caller should fall
 * through). Calls onBeforeJump(delta) before scrolling so the caller can
 * translate the text selection by the scroll delta (capture outgoing rows,
 * shift anchor+focus) instead of clearing it. Exported for testing.
 */
export function applyModalPagerAction(s: ScrollBoxHandle, act: ModalPagerAction | null, onBeforeJump: (delta: number) => void): boolean | null {
  switch (act) {
    case null:
      return null;
    case 'lineUp':
    case 'lineDown':
      {
        const d = act === 'lineDown' ? 1 : -1;
        onBeforeJump(d);
        return jumpBy(s, d);
      }
    case 'halfPageUp':
    case 'halfPageDown':
      {
        const half = Math.max(1, Math.floor(s.getViewportHeight() / 2));
        const d = act === 'halfPageDown' ? half : -half;
        onBeforeJump(d);
        return jumpBy(s, d);
      }
    case 'fullPageUp':
    case 'fullPageDown':
      {
        const page = Math.max(1, s.getViewportHeight());
        const d = act === 'fullPageDown' ? page : -page;
        onBeforeJump(d);
        return jumpBy(s, d);
      }
    case 'top':
      onBeforeJump(-(s.getScrollTop() + s.getPendingDelta()));
      s.scrollTo(0);
      return false;
    case 'bottom':
      {
        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight());
        onBeforeJump(max - (s.getScrollTop() + s.getPendingDelta()));
        // Eager-write scrollTop before scrollToBottom β€” same double-shift
        // fix as scroll:bottom and jumpBy's max branch.
        s.scrollTo(max);
        s.scrollToBottom();
        return true;
      }
  }
}
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["React","RefObject","useEffect","useRef","useNotifications","useCopyOnSelect","useSelectionBgColor","ScrollBoxHandle","useSelection","FocusMove","SelectionState","isXtermJs","getClipboardPath","Key","useInput","useKeybindings","logForDebugging","Props","scrollRef","isActive","onScroll","sticky","handle","isModal","WHEEL_ACCEL_WINDOW_MS","WHEEL_ACCEL_STEP","WHEEL_ACCEL_MAX","WHEEL_BOUNCE_GAP_MAX_MS","WHEEL_MODE_STEP","WHEEL_MODE_CAP","WHEEL_MODE_RAMP","WHEEL_MODE_IDLE_DISENGAGE_MS","WHEEL_DECAY_HALFLIFE_MS","WHEEL_DECAY_STEP","WHEEL_BURST_MS","WHEEL_DECAY_GAP_MS","WHEEL_DECAY_CAP_SLOW","WHEEL_DECAY_CAP_FAST","WHEEL_DECAY_IDLE_MS","shouldClearSelectionOnKey","key","wheelUp","wheelDown","isNav","leftArrow","rightArrow","upArrow","downArrow","home","end","pageUp","pageDown","shift","meta","super","selectionFocusMoveForKey","WheelAccelState","time","mult","dir","xtermJs","frac","base","pendingFlip","wheelMode","burstCount","computeWheelStep","state","now","Math","floor","gap","m","pow","cap","max","next","min","sameDir","total","rows","readScrollSpeedBase","raw","process","env","CLAUDE_CODE_SCROLL_SPEED","n","parseFloat","Number","isNaN","initWheelAccel","initAndLogWheelAccel","TERM_PROGRAM","AUTOSCROLL_LINES","AUTOSCROLL_INTERVAL_MS","AUTOSCROLL_MAX_TICKS","ScrollKeybindingHandler","ReactNode","selection","addNotification","wheelAccel","showCopiedToast","text","path","length","msg","color","priority","timeoutMs","copyAndToast","copySelection","translateSelectionForJump","s","delta","sel","getState","anchor","focus","top","getViewportTop","bottom","getViewportHeight","row","getScrollHeight","cur","getScrollTop","getPendingDelta","actual","captureScrolledRows","shiftSelection","a","scroll:pageUp","current","d","jumpBy","scroll:pageDown","scroll:lineUp","clearSelection","scrollUp","performance","scroll:lineDown","step","reachedBottom","scrollDown","scroll:top","scrollTo","scroll:bottom","scrollToBottom","context","scroll:halfPageUp","scroll:halfPageDown","scroll:fullPageUp","scroll:fullPageDown","input","event","applyModalPagerAction","modalPagerAction","stopImmediatePropagation","hasSelection","escape","ctrl","move","moveFocus","useDragToScroll","ReturnType","timerRef","NodeJS","Timeout","dirRef","lastScrolledDirRef","ticksRef","onScrollRef","stop","clearInterval","tick","isDragging","shiftAnchor","scrollBy","start","setInterval","check","scrolledOffAbove","scrolledOffBelow","dragScrollDirection","want","scrolledOffAboveSW","scrolledOffBelowSW","unsubscribe","subscribe","alreadyScrollingDir","target","amount","effectiveTop","ModalPagerAction","Pick","c","repeat","act","onBeforeJump","half","page"],"sources":["ScrollKeybindingHandler.tsx"],"sourcesContent":["import React, { type RefObject, useEffect, useRef } from 'react'\nimport { useNotifications } from '../context/notifications.js'\nimport {\n  useCopyOnSelect,\n  useSelectionBgColor,\n} from '../hooks/useCopyOnSelect.js'\nimport type { ScrollBoxHandle } from '../ink/components/ScrollBox.js'\nimport { useSelection } from '../ink/hooks/use-selection.js'\nimport type { FocusMove, SelectionState } from '../ink/selection.js'\nimport { isXtermJs } from '../ink/terminal.js'\nimport { getClipboardPath } from '../ink/termio/osc.js'\n// eslint-disable-next-line custom-rules/prefer-use-keybindings -- Esc needs conditional propagation based on selection state\nimport { type Key, useInput } from '../ink.js'\nimport { useKeybindings } from '../keybindings/useKeybinding.js'\nimport { logForDebugging } from '../utils/debug.js'\n\ntype Props = {\n  scrollRef: RefObject<ScrollBoxHandle | null>\n  isActive: boolean\n  /** Called after every scroll action with the resulting sticky state and\n   *  the handle (for reading scrollTop/scrollHeight post-scroll). */\n  onScroll?: (sticky: boolean, handle: ScrollBoxHandle) => void\n  /** Enables modal pager keys (g/G, ctrl+u/d/b/f). Only safe when there\n   *  is no text input competing for those characters — i.e. transcript\n   *  mode. Defaults to false. When true, G works regardless of editorMode\n   *  and sticky state; ctrl+u/d/b/f don't conflict with kill-line/exit/\n   *  task:background/kill-agents (none are mounted, or they mount after\n   *  this component so stopImmediatePropagation wins). */\n  isModal?: boolean\n}\n\n// Terminals send one SGR wheel event per intended row (verified in Ghostty\n// src/Surface.zig: `for (0..@abs(y.delta)) |_| { mouseReport(.four, ...) }`).\n// Ghostty already 3×'s discrete wheel ticks before that loop; trackpad\n// precision scroll is pixels/cell_size. 1 event = 1 row intended — use it\n// as the base, and ramp a multiplier when events arrive rapidly. The\n// pendingScrollDelta accumulator + proportional drain in\n// render-node-to-output handles smooth catch-up on big bursts.\n//\n// xterm.js (VS Code/Cursor/Windsurf integrated terminals) sends exactly 1\n// event per wheel notch — no pre-amplification. A separate exponential\n// decay curve (below) compensates for the lower event rate, with burst\n// detection and gap-dependent caps tuned to VS Code's event patterns.\n\n// Native terminals: hard-window linear ramp. Events closer than the window\n// ramp the multiplier; idle gaps reset to `base` (default 1). Some emulators\n// pre-multiply at their layer (ghostty discrete=3 sends 3 SGR events/notch;\n// iTerm2 \"faster scroll\" similar) — base=1 is correct there. Others send 1\n// event/notch — users on those can set CLAUDE_CODE_SCROLL_SPEED=3 to match\n// vim/nvim/opencode app-side defaults. We can't detect which, so knob it.\nconst WHEEL_ACCEL_WINDOW_MS = 40\nconst WHEEL_ACCEL_STEP = 0.3\nconst WHEEL_ACCEL_MAX = 6\n\n// Encoder bounce debounce + wheel-mode decay curve. Worn/cheap optical\n// encoders emit spurious reverse-direction ticks during fast spins — measured\n// 28% of events on Boris's mouse (2026-03-17, iTerm2). Pattern is always\n// flip-then-flip-back; trackpads produce ZERO flips (0/458 in same recording).\n// A confirmed bounce proves a physical wheel is attached — engage the same\n// exponential-decay curve the xterm.js path uses (it's already tuned), with\n// a higher cap to compensate for the lower event rate (~9/sec vs VS Code's\n// ~30/sec). Trackpad can't reach this path.\n//\n// The decay curve gives: 1st click after idle = 1 row (precision), 2nd = 10,\n// 3rd = cap. Slowing down decays smoothly toward 1 — no separate idle\n// threshold needed, large gaps just have m≈0 → mult→1. Wheel mode is STICKY:\n// once a bounce confirms it's a mouse, the decay curve applies until an idle\n// gap or trackpad-flick-burst signals a possible device switch.\nconst WHEEL_BOUNCE_GAP_MAX_MS = 200 // flip-back must arrive within this\n// Mouse is ~9 events/sec vs VS Code's ~30 — STEP is 3× xterm.js's 5 to\n// compensate. At gap=100ms (m≈0.63): one click gives 1+15*0.63≈10.5.\nconst WHEEL_MODE_STEP = 15\nconst WHEEL_MODE_CAP = 15\n// Max mult growth per event. Without this, the +STEP*m term jumps mult\n// from 1→10 in one event when wheelMode engages mid-scroll (bounce\n// detected after N events in trackpad mode at mult=1). User sees scroll\n// suddenly go 10× faster. Cap=3 gives 1→4→7→10→13→15 over ~0.5s at\n// 9 events/sec — smooth ramp instead of a jump. Decay is unaffected\n// (target<mult wins the min).\nconst WHEEL_MODE_RAMP = 3\n// Device-switch disengage: mouse finger-repositions max at ~830ms (measured);\n// trackpad between-gesture pauses are 2000ms+. An idle gap above this means\n// the user stopped — might have switched devices. Disengage; the next mouse\n// bounce re-engages. Trackpad slow swipe (no <5ms bursts, so the burst-count\n// guard doesn't catch it) is what this protects against.\nconst WHEEL_MODE_IDLE_DISENGAGE_MS = 1500\n\n// xterm.js: exponential decay. momentum=0.5^(gap/hl) — slow click → m≈0\n// → mult→1 (precision); fast → m≈1 → carries momentum. Steady-state\n// = 1 + step×m/(1-m), capped. Measured event rates in VS Code (wheel.log):\n// sustained scroll sends events at 20-50ms gaps (20-40 Hz), plus 0-2ms\n// same-batch bursts on flicks. Cap is low (3–6, gap-dependent) because event\n// frequency is high — at 40 Hz × 6 = 240 rows/sec max demand, which the\n// adaptive drain at ~200fps (measured) handles. Higher cap → pending explosion.\n// Tuned empirically (boris 2026-03). See docs/research/terminal-scroll-*.\nconst WHEEL_DECAY_HALFLIFE_MS = 150\nconst WHEEL_DECAY_STEP = 5\n// Same-batch events (<BURST_MS) arrive in one stdin batch — the terminal\n// is doing proportional reporting. Treat as 1 row/event like native.\nconst WHEEL_BURST_MS = 5\n// Cap boundary: slow events (≥GAP_MS) cap low for short smooth drains;\n// fast events cap higher for throughput (adaptive drain handles backlog).\nconst WHEEL_DECAY_GAP_MS = 80\nconst WHEEL_DECAY_CAP_SLOW = 3 // gap ≥ GAP_MS: precision\nconst WHEEL_DECAY_CAP_FAST = 6 // gap < GAP_MS: throughput\n// Idle threshold: gaps beyond this reset to the kick value (2) so the\n// first click after a pause feels responsive regardless of direction.\nconst WHEEL_DECAY_IDLE_MS = 500\n\n/**\n * Whether a keypress should clear the virtual text selection. Mimics\n * native terminal selection: any keystroke clears, EXCEPT modified nav\n * keys (shift/opt/cmd + arrow/home/end/page*). In native macOS contexts,\n * shift+nav extends selection, and cmd/opt+nav are often intercepted by\n * the terminal emulator for scrollback nav — neither disturbs selection.\n * Bare arrows DO clear (user's cursor moves, native deselects). Wheel is\n * excluded — scroll:lineUp/Down already clears via the keybinding path.\n */\nexport function shouldClearSelectionOnKey(key: Key): boolean {\n  if (key.wheelUp || key.wheelDown) return false\n  const isNav =\n    key.leftArrow ||\n    key.rightArrow ||\n    key.upArrow ||\n    key.downArrow ||\n    key.home ||\n    key.end ||\n    key.pageUp ||\n    key.pageDown\n  if (isNav && (key.shift || key.meta || key.super)) return false\n  return true\n}\n\n/**\n * Map a keypress to a selection focus move (keyboard extension). Only\n * shift extends — that's the universal text-selection modifier. cmd\n * (super) only arrives via kitty keyboard protocol — in most terminals\n * cmd+arrow is intercepted by the emulator and never reaches the pty, so\n * no super branch. shift+home/end covers line-edge jumps (and fn+shift+\n * left/right on mac laptops = shift+home/end). shift+opt (word-jump) not\n * yet implemented — falls through to shouldClearSelectionOnKey which\n * preserves (modified nav). Returns null for non-extend keys.\n */\nexport function selectionFocusMoveForKey(key: Key): FocusMove | null {\n  if (!key.shift || key.meta) return null\n  if (key.leftArrow) return 'left'\n  if (key.rightArrow) return 'right'\n  if (key.upArrow) return 'up'\n  if (key.downArrow) return 'down'\n  if (key.home) return 'lineStart'\n  if (key.end) return 'lineEnd'\n  return null\n}\n\nexport type WheelAccelState = {\n  time: number\n  mult: number\n  dir: 0 | 1 | -1\n  xtermJs: boolean\n  /** Carried fractional scroll (xterm.js only). scrollBy floors, so without\n   *  this a mult of 1.5 gives 1 row every time. Carrying the remainder gives\n   *  1,2,1,2 on average for mult=1.5 — correct throughput over time. */\n  frac: number\n  /** Native-path baseline rows/event. Reset value on idle/reversal; ramp\n   *  builds on top. xterm.js path ignores this (own kick=2 tuning). */\n  base: number\n  /** Deferred direction flip (native only). Might be encoder bounce or a\n   *  real reversal — resolved by the NEXT event. Real reversal loses 1 row\n   *  of latency; bounce is swallowed and triggers wheel mode. The flip's\n   *  direction and timestamp are derivable (it's always -state.dir at\n   *  state.time) so this is just a marker. */\n  pendingFlip: boolean\n  /** Set true once a bounce is confirmed (flip-then-flip-back within\n   *  BOUNCE_GAP_MAX). Sticky — but disengaged on idle gap >1500ms OR a\n   *  trackpad-signature burst (see burstCount). State lives in a useRef so\n   *  it persists across device switches; the disengages handle mouse→trackpad. */\n  wheelMode: boolean\n  /** Consecutive <5ms events. Trackpad flick produces 100+ at <5ms; mouse\n   *  produces ≤3 (verified in /tmp/wheel-tune.txt). 5+ in a row → trackpad\n   *  signature → disengage wheel mode so device-switch doesn't leak mouse\n   *  accel to trackpad. */\n  burstCount: number\n}\n\n/** Compute rows for one wheel event, mutating accel state. Returns 0 when\n *  a direction flip is deferred for bounce detection — call sites no-op on\n *  step=0 (scrollBy(0) is a no-op, onScroll(false) is idempotent). Exported\n *  for tests. */\nexport function computeWheelStep(\n  state: WheelAccelState,\n  dir: 1 | -1,\n  now: number,\n): number {\n  if (!state.xtermJs) {\n    // Device-switch guard ①: idle disengage. Runs BEFORE pendingFlip resolve\n    // so a pending bounce (28% of last-mouse-events) doesn't bypass it via\n    // the real-reversal early return. state.time is either the last committed\n    // event OR the deferred flip — both count as \"last activity\".\n    if (state.wheelMode && now - state.time > WHEEL_MODE_IDLE_DISENGAGE_MS) {\n      state.wheelMode = false\n      state.burstCount = 0\n      state.mult = state.base\n    }\n\n    // Resolve any deferred flip BEFORE touching state.time/dir — we need the\n    // pre-flip state.dir to distinguish bounce (flip-back) from real reversal\n    // (flip persisted), and state.time (= bounce timestamp) for the gap check.\n    if (state.pendingFlip) {\n      state.pendingFlip = false\n      if (dir !== state.dir || now - state.time > WHEEL_BOUNCE_GAP_MAX_MS) {\n        // Real reversal: new dir persisted, OR flip-back arrived too late.\n        // Commit. The deferred event's 1 row is lost (acceptable latency).\n        state.dir = dir\n        state.time = now\n        state.mult = state.base\n        return Math.floor(state.mult)\n      }\n      // Bounce confirmed: flipped back to original dir within the window.\n      // state.dir/mult unchanged from pre-bounce. state.time was advanced to\n      // the bounce below, so gap here = flip-back interval — reflects the\n      // user's actual click cadence (bounce IS a physical click, just noisy).\n      state.wheelMode = true\n    }\n\n    const gap = now - state.time\n    if (dir !== state.dir && state.dir !== 0) {\n      // Flip. Defer — next event decides bounce vs. real reversal. Advance\n      // time (but NOT dir/mult): if this turns out to be a bounce, the\n      // confirm event's gap will be the flip-back interval, which reflects\n      // the user's actual click rate. The bounce IS a physical wheel click,\n      // just misread by the encoder — it should count toward cadence.\n      state.pendingFlip = true\n      state.time = now\n      return 0\n    }\n    state.dir = dir\n    state.time = now\n\n    // ─── MOUSE (wheel mode, sticky until device-switch signal) ───\n    if (state.wheelMode) {\n      if (gap < WHEEL_BURST_MS) {\n        // Same-batch burst check (ported from xterm.js): iTerm2 proportional\n        // reporting sends 2+ SGR events for one detent when macOS gives\n        // delta>1. Without this, the 2nd event at gap<1ms has m≈1 → STEP*m=15\n        // → one gentle click gives 1+15=16 rows.\n        //\n        // Device-switch guard ②: trackpad flick produces 100+ events at <5ms\n        // (measured); mouse produces ≤3. 5+ consecutive → trackpad flick.\n        if (++state.burstCount >= 5) {\n          state.wheelMode = false\n          state.burstCount = 0\n          state.mult = state.base\n        } else {\n          return 1\n        }\n      } else {\n        state.burstCount = 0\n      }\n    }\n    // Re-check: may have disengaged above.\n    if (state.wheelMode) {\n      // xterm.js decay curve with STEP×3, higher cap. No idle threshold —\n      // the curve handles it (gap=1000ms → m≈0.01 → mult≈1). No frac —\n      // rounding loss is minor at high mult, and frac persisting across idle\n      // was causing off-by-one on the first click back.\n      const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS)\n      const cap = Math.max(WHEEL_MODE_CAP, state.base * 2)\n      const next = 1 + (state.mult - 1) * m + WHEEL_MODE_STEP * m\n      state.mult = Math.min(cap, next, state.mult + WHEEL_MODE_RAMP)\n      return Math.floor(state.mult)\n    }\n\n    // ─── TRACKPAD / HI-RES (native, non-wheel-mode) ───\n    // Tight 40ms burst window: sub-40ms events ramp, anything slower resets.\n    // Trackpad flick delivers 200+ events at <20ms gaps → rails to cap 6.\n    // Trackpad slow swipe at 40-400ms gaps → resets every event → 1 row each.\n    if (gap > WHEEL_ACCEL_WINDOW_MS) {\n      state.mult = state.base\n    } else {\n      const cap = Math.max(WHEEL_ACCEL_MAX, state.base * 2)\n      state.mult = Math.min(cap, state.mult + WHEEL_ACCEL_STEP)\n    }\n    return Math.floor(state.mult)\n  }\n\n  // ─── VSCODE (xterm.js, browser wheel events) ───\n  // Browser wheel events — no encoder bounce, no SGR bursts. Decay curve\n  // unchanged from the original tuning. Same formula shape as wheel mode\n  // above (keep in sync) but STEP=5 not 15 — higher event rate here.\n  const gap = now - state.time\n  const sameDir = dir === state.dir\n  state.time = now\n  state.dir = dir\n  // xterm.js path. Debug log shows two patterns: (a) 20-50ms gaps during\n  // sustained scroll (~30 Hz), (b) <5ms same-batch bursts on flicks. For\n  // (b) give 1 row/event — the burst count IS the acceleration, same as\n  // native. For (a) the decay curve gives 3-5 rows. For sparse events\n  // (100ms+, slow deliberate scroll) the curve gives 1-3.\n  if (sameDir && gap < WHEEL_BURST_MS) return 1\n  if (!sameDir || gap > WHEEL_DECAY_IDLE_MS) {\n    // Direction reversal or long idle: start at 2 (not 1) so the first\n    // click after a pause moves a visible amount. Without this, idle-\n    // then-resume in the same direction decays to mult≈1 (1 row).\n    state.mult = 2\n    state.frac = 0\n  } else {\n    const m = Math.pow(0.5, gap / WHEEL_DECAY_HALFLIFE_MS)\n    const cap =\n      gap >= WHEEL_DECAY_GAP_MS ? WHEEL_DECAY_CAP_SLOW : WHEEL_DECAY_CAP_FAST\n    state.mult = Math.min(cap, 1 + (state.mult - 1) * m + WHEEL_DECAY_STEP * m)\n  }\n  const total = state.mult + state.frac\n  const rows = Math.floor(total)\n  state.frac = total - rows\n  return rows\n}\n\n/** Read CLAUDE_CODE_SCROLL_SPEED, default 1, clamp (0, 20].\n *  Some terminals pre-multiply wheel events (ghostty discrete=3, iTerm2\n *  \"faster scroll\") — base=1 is correct there. Others send 1 event/notch —\n *  set CLAUDE_CODE_SCROLL_SPEED=3 to match vim/nvim/opencode. We can't\n *  detect which kind of terminal we're in, hence the knob. Called lazily\n *  from initAndLogWheelAccel so globalSettings.env has loaded. */\nexport function readScrollSpeedBase(): number {\n  const raw = process.env.CLAUDE_CODE_SCROLL_SPEED\n  if (!raw) return 1\n  const n = parseFloat(raw)\n  return Number.isNaN(n) || n <= 0 ? 1 : Math.min(n, 20)\n}\n\n/** Initial wheel accel state. xtermJs=true selects the decay curve.\n *  base is the native-path baseline rows/event (default 1). */\nexport function initWheelAccel(xtermJs = false, base = 1): WheelAccelState {\n  return {\n    time: 0,\n    mult: base,\n    dir: 0,\n    xtermJs,\n    frac: 0,\n    base,\n    pendingFlip: false,\n    wheelMode: false,\n    burstCount: 0,\n  }\n}\n\n// Lazy-init helper. isXtermJs() combines the TERM_PROGRAM env check + async\n// XTVERSION probe — the probe may not have resolved at render time, so this\n// is called on the first wheel event (>>50ms after startup) when it's settled.\n// Logs detected mode once so --debug users can verify SSH detection worked.\n// The renderer also calls isXtermJsHost() (in render-node-to-output) to\n// select the drain algorithm — no state to pass through.\nfunction initAndLogWheelAccel(): WheelAccelState {\n  const xtermJs = isXtermJs()\n  const base = readScrollSpeedBase()\n  logForDebugging(\n    `wheel accel: ${xtermJs ? 'decay (xterm.js)' : 'window (native)'} · base=${base} · TERM_PROGRAM=${process.env.TERM_PROGRAM ?? 'unset'}`,\n  )\n  return initWheelAccel(xtermJs, base)\n}\n\n// Drag-to-scroll: when dragging past the viewport edge, scroll by this many\n// rows every AUTOSCROLL_INTERVAL_MS. Mode 1002 mouse tracking only fires on\n// cell change, so a timer is needed to continue scrolling while stationary.\nconst AUTOSCROLL_LINES = 2\nconst AUTOSCROLL_INTERVAL_MS = 50\n// Hard cap on consecutive auto-scroll ticks. If the release event is lost\n// (mouse released outside terminal window — some emulators don't capture the\n// pointer and drop the release), isDragging stays true and the timer would\n// run until a scroll boundary. Cap bounds the damage; any new drag motion\n// event restarts the count via check()→start().\nconst AUTOSCROLL_MAX_TICKS = 200 // 10s @ 50ms\n\n/**\n * Keyboard scroll navigation for the fullscreen layout's message scroll box.\n * PgUp/PgDn scroll by half-viewport. Mouse wheel scrolls by a few lines.\n * Scrolling breaks sticky mode; Ctrl+End re-enables it. Wheeling down at\n * the bottom also re-enables sticky so new content follows naturally.\n */\nexport function ScrollKeybindingHandler({\n  scrollRef,\n  isActive,\n  onScroll,\n  isModal = false,\n}: Props): React.ReactNode {\n  const selection = useSelection()\n  const { addNotification } = useNotifications()\n  // Lazy-inited on first wheel event so the XTVERSION probe (fired at\n  // raw-mode-enable time) has resolved by then — initializing in useRef()\n  // would read getWheelBase() before the probe reply arrives over SSH.\n  const wheelAccel = useRef<WheelAccelState | null>(null)\n\n  function showCopiedToast(text: string): void {\n    // getClipboardPath reads env synchronously — predicts what setClipboard\n    // did (native pbcopy / tmux load-buffer / raw OSC 52) so we can tell\n    // the user whether paste will Just Work or needs prefix+].\n    const path = getClipboardPath()\n    const n = text.length\n    let msg: string\n    switch (path) {\n      case 'native':\n        msg = `copied ${n} chars to clipboard`\n        break\n      case 'tmux-buffer':\n        msg = `copied ${n} chars to tmux buffer · paste with prefix + ]`\n        break\n      case 'osc52':\n        msg = `sent ${n} chars via OSC 52 · check terminal clipboard settings if paste fails`\n        break\n    }\n    addNotification({\n      key: 'selection-copied',\n      text: msg,\n      color: 'suggestion',\n      priority: 'immediate',\n      timeoutMs: path === 'native' ? 2000 : 4000,\n    })\n  }\n\n  function copyAndToast(): void {\n    const text = selection.copySelection()\n    if (text) showCopiedToast(text)\n  }\n\n  // Translate selection to track a keyboard page jump. Selection coords are\n  // screen-buffer-local; a scrollTo that moves content by N rows must also\n  // shift anchor+focus by N so the highlight stays on the same text (native\n  // terminal behavior: selection moves with content, clips at viewport\n  // edges). Rows that scroll out of the viewport are captured into\n  // scrolledOffAbove/Below before the scroll so getSelectedText still\n  // returns the full text. Wheel scroll (scroll:lineUp/Down via scrollBy)\n  // still clears — its async pendingScrollDelta drain means the actual\n  // delta isn't known synchronously (follow-up).\n  function translateSelectionForJump(s: ScrollBoxHandle, delta: number): void {\n    const sel = selection.getState()\n    if (!sel?.anchor || !sel.focus) return\n    const top = s.getViewportTop()\n    const bottom = top + s.getViewportHeight() - 1\n    // Only translate if the selection is ON scrollbox content. Selections\n    // in the footer/prompt/StickyPromptHeader are on static text — the\n    // scroll doesn't move what's under them. Same guard as ink.tsx's\n    // auto-follow translate (commit 36a8d154).\n    if (sel.anchor.row < top || sel.anchor.row > bottom) return\n    // Cross-boundary: anchor in scrollbox, focus in footer/header. Mirror\n    // ink.tsx's Flag-3 guard — fall through without shifting OR capturing.\n    // The static endpoint pins the selection; shifting would teleport it\n    // into scrollbox content.\n    if (sel.focus.row < top || sel.focus.row > bottom) return\n    const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n    const cur = s.getScrollTop() + s.getPendingDelta()\n    // Actual scroll distance after boundary clamp. jumpBy may call\n    // scrollToBottom when target >= max but the view can't move past max,\n    // so the selection shift is bounded here.\n    const actual = Math.max(0, Math.min(max, cur + delta)) - cur\n    if (actual === 0) return\n    if (actual > 0) {\n      // Scrolling down: content moves up. Rows at the TOP leave viewport.\n      // Anchor+focus shift -actual so they track the content that moved up.\n      selection.captureScrolledRows(top, top + actual - 1, 'above')\n      selection.shiftSelection(-actual, top, bottom)\n    } else {\n      // Scrolling up: content moves down. Rows at the BOTTOM leave viewport.\n      const a = -actual\n      selection.captureScrolledRows(bottom - a + 1, bottom, 'below')\n      selection.shiftSelection(a, top, bottom)\n    }\n  }\n\n  useKeybindings(\n    {\n      'scroll:pageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:pageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:lineUp': () => {\n        // Wheel: scrollBy accumulates into pendingScrollDelta, drained async\n        // by the renderer. captureScrolledRows can't read the outgoing rows\n        // before they leave (drain is non-deterministic). Clear for now.\n        selection.clearSelection()\n        const s = scrollRef.current\n        // Return false (not consumed) when the ScrollBox content fits —\n        // scroll would be a no-op. Lets a child component's handler take\n        // the wheel event instead (e.g. Settings Config's list navigation\n        // inside the centered Modal, where the paginated slice always fits).\n        if (!s || s.getScrollHeight() <= s.getViewportHeight()) return false\n        wheelAccel.current ??= initAndLogWheelAccel()\n        scrollUp(s, computeWheelStep(wheelAccel.current, -1, performance.now()))\n        onScroll?.(false, s)\n      },\n      'scroll:lineDown': () => {\n        selection.clearSelection()\n        const s = scrollRef.current\n        if (!s || s.getScrollHeight() <= s.getViewportHeight()) return false\n        wheelAccel.current ??= initAndLogWheelAccel()\n        const step = computeWheelStep(wheelAccel.current, 1, performance.now())\n        const reachedBottom = scrollDown(s, step)\n        onScroll?.(reachedBottom, s)\n      },\n      'scroll:top': () => {\n        const s = scrollRef.current\n        if (!s) return\n        translateSelectionForJump(s, -(s.getScrollTop() + s.getPendingDelta()))\n        s.scrollTo(0)\n        onScroll?.(false, s)\n      },\n      'scroll:bottom': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n        translateSelectionForJump(\n          s,\n          max - (s.getScrollTop() + s.getPendingDelta()),\n        )\n        // scrollTo(max) eager-writes scrollTop so the render-phase sticky\n        // follow computes followDelta=0. Without this, scrollToBottom()\n        // alone leaves scrollTop stale → followDelta=max-stale →\n        // shiftSelectionForFollow applies the SAME shift we already did\n        // above, 2× offset. scrollToBottom() then re-enables sticky.\n        s.scrollTo(max)\n        s.scrollToBottom()\n        onScroll?.(true, s)\n      },\n      'selection:copy': copyAndToast,\n    },\n    { context: 'Scroll', isActive },\n  )\n\n  // scroll:halfPage*/fullPage* have no default key bindings — ctrl+u/d/b/f\n  // all have real owners in normal mode (kill-line/exit/task:background/\n  // kill-agents). Transcript mode gets them via the isModal raw useInput\n  // below. These handlers stay for custom rebinds only.\n  useKeybindings(\n    {\n      'scroll:halfPageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:halfPageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:fullPageUp': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = -Math.max(1, s.getViewportHeight())\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n      'scroll:fullPageDown': () => {\n        const s = scrollRef.current\n        if (!s) return\n        const d = Math.max(1, s.getViewportHeight())\n        translateSelectionForJump(s, d)\n        const sticky = jumpBy(s, d)\n        onScroll?.(sticky, s)\n      },\n    },\n    { context: 'Scroll', isActive },\n  )\n\n  // Modal pager keys — transcript mode only. less/tmux copy-mode lineage:\n  // ctrl+u/d (half-page), ctrl+b/f (full-page), g/G (top/bottom). Tom's\n  // resolution (2026-03-15): \"In ctrl-o mode, ctrl-u, ctrl-d, etc. should\n  // roughly just work!\" — transcript is the copy-mode container.\n  //\n  // Safe because the conflicting handlers aren't reachable here:\n  //   ctrl+u → kill-line, ctrl+d → exit: PromptInput not mounted\n  //   ctrl+b → task:background: SessionBackgroundHint not mounted\n  //   ctrl+f → chat:killAgents moved to ctrl+x ctrl+k; no conflict\n  //   g/G → printable chars: no prompt to eat them, no vim/sticky gate needed\n  //\n  // TODO(search): `/`, n/N — build on Richard Kim's d94b07add4 (branch\n  // claude/jump-recent-message-CEPcq). getItemY Yoga-walk + computeOrigin +\n  // anchorY already solve scroll-to-index. jumpToPrevTurn is the n/N\n  // template. Single-shot via OVERSCAN_ROWS=80; two-phase was tried and\n  // abandoned (❯ oscillation). See team memory scroll-copy-mode-design.md.\n  useInput(\n    (input, key, event) => {\n      const s = scrollRef.current\n      if (!s) return\n      const sticky = applyModalPagerAction(s, modalPagerAction(input, key), d =>\n        translateSelectionForJump(s, d),\n      )\n      if (sticky === null) return\n      onScroll?.(sticky, s)\n      event.stopImmediatePropagation()\n    },\n    { isActive: isActive && isModal },\n  )\n\n  // Esc clears selection; any other keystroke also clears it (matches\n  // native terminal behavior where selection disappears on input).\n  // Ctrl+C copies when a selection exists — needed on legacy terminals\n  // where ctrl+shift+c sends the same byte (\\x03, shift is lost) and\n  // cmd+c never reaches the pty (terminal intercepts it for Edit > Copy).\n  // Handled via raw useInput so we can conditionally consume: Esc/Ctrl+C\n  // only stop propagation when a selection exists, letting them still work\n  // for cancel-request / interrupt otherwise. Other keys never stop\n  // propagation — they're observed to clear selection as a side-effect.\n  // The selection:copy keybinding (ctrl+shift+c / cmd+c) registers above\n  // via useKeybindings and consumes its event before reaching here.\n  useInput(\n    (input, key, event) => {\n      if (!selection.hasSelection()) return\n      if (key.escape) {\n        selection.clearSelection()\n        event.stopImmediatePropagation()\n        return\n      }\n      if (key.ctrl && !key.shift && !key.meta && input === 'c') {\n        copyAndToast()\n        event.stopImmediatePropagation()\n        return\n      }\n      const move = selectionFocusMoveForKey(key)\n      if (move) {\n        selection.moveFocus(move)\n        event.stopImmediatePropagation()\n        return\n      }\n      if (shouldClearSelectionOnKey(key)) {\n        selection.clearSelection()\n      }\n    },\n    { isActive },\n  )\n\n  useDragToScroll(scrollRef, selection, isActive, onScroll)\n  useCopyOnSelect(selection, isActive, showCopiedToast)\n  useSelectionBgColor(selection)\n\n  return null\n}\n\n/**\n * Auto-scroll the ScrollBox when the user drags a selection past its top or\n * bottom edge. The anchor is shifted in the opposite direction so it stays\n * on the same content (content that was at viewport row N is now at row N±d\n * after scrolling by d). Focus stays at the mouse position (edge row).\n *\n * Selection coords are screen-buffer-local, so the anchor is clamped to the\n * viewport bounds once the original content scrolls out. To preserve the full\n * selection, rows about to scroll out are captured into scrolledOffAbove/\n * scrolledOffBelow before each scroll step and joined back in by\n * getSelectedText.\n */\nfunction useDragToScroll(\n  scrollRef: RefObject<ScrollBoxHandle | null>,\n  selection: ReturnType<typeof useSelection>,\n  isActive: boolean,\n  onScroll: Props['onScroll'],\n): void {\n  const timerRef = useRef<NodeJS.Timeout | null>(null)\n  const dirRef = useRef<-1 | 0 | 1>(0) // -1 scrolling up, +1 down, 0 idle\n  // Survives stop() — reset only on drag-finish. See check() for semantics.\n  const lastScrolledDirRef = useRef<-1 | 0 | 1>(0)\n  const ticksRef = useRef(0)\n  // onScroll may change identity every render (if not memoized by caller).\n  // Read through a ref so the effect doesn't re-subscribe and kill the timer\n  // on each scroll-induced re-render.\n  const onScrollRef = useRef(onScroll)\n  onScrollRef.current = onScroll\n\n  useEffect(() => {\n    if (!isActive) return\n\n    function stop(): void {\n      dirRef.current = 0\n      if (timerRef.current) {\n        clearInterval(timerRef.current)\n        timerRef.current = null\n      }\n    }\n\n    function tick(): void {\n      const sel = selection.getState()\n      const s = scrollRef.current\n      const dir = dirRef.current\n      // dir === 0 defends against a stale interval (start() may have set one\n      // after the immediate tick already called stop() at a scroll boundary).\n      // ticks cap defends against a lost release event (mouse released\n      // outside terminal window) leaving isDragging stuck true.\n      if (\n        !sel?.isDragging ||\n        !sel.focus ||\n        !s ||\n        dir === 0 ||\n        ++ticksRef.current > AUTOSCROLL_MAX_TICKS\n      ) {\n        stop()\n        return\n      }\n      // scrollBy accumulates into pendingScrollDelta; the screen buffer\n      // doesn't update until the next render drains it. If a previous\n      // tick's scroll hasn't drained yet, captureScrolledRows would read\n      // stale content (same rows as last tick → duplicated in the\n      // accumulator AND missing the rows that actually scrolled out).\n      // Skip this tick; the 50ms interval will retry after Ink's 16ms\n      // render catches up. Also prevents shiftAnchor from desyncing.\n      if (s.getPendingDelta() !== 0) return\n      const top = s.getViewportTop()\n      const bottom = top + s.getViewportHeight() - 1\n      // Clamp anchor within [top, bottom]. Not [0, bottom]: the ScrollBox\n      // padding row at 0 would produce a blank line between scrolledOffAbove\n      // and the on-screen content in getSelectedText. The padding-row\n      // highlight was a minor visual nicety; text correctness wins.\n      if (dir < 0) {\n        if (s.getScrollTop() <= 0) {\n          stop()\n          return\n        }\n        // Scrolling up: content moves down in viewport, so anchor row +N.\n        // Clamp to actual scroll distance so anchor stays in sync when near\n        // the top boundary (renderer clamps scrollTop to 0 on drain).\n        const actual = Math.min(AUTOSCROLL_LINES, s.getScrollTop())\n        // Capture rows about to scroll out the BOTTOM before scrollBy\n        // overwrites them. Only rows inside the selection are captured\n        // (captureScrolledRows intersects with selection bounds).\n        selection.captureScrolledRows(bottom - actual + 1, bottom, 'below')\n        selection.shiftAnchor(actual, 0, bottom)\n        s.scrollBy(-AUTOSCROLL_LINES)\n      } else {\n        const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n        if (s.getScrollTop() >= max) {\n          stop()\n          return\n        }\n        // Scrolling down: content moves up in viewport, so anchor row -N.\n        // Clamp to actual scroll distance so anchor stays in sync when near\n        // the bottom boundary (renderer clamps scrollTop to max on drain).\n        const actual = Math.min(AUTOSCROLL_LINES, max - s.getScrollTop())\n        // Capture rows about to scroll out the TOP.\n        selection.captureScrolledRows(top, top + actual - 1, 'above')\n        selection.shiftAnchor(-actual, top, bottom)\n        s.scrollBy(AUTOSCROLL_LINES)\n      }\n      onScrollRef.current?.(false, s)\n    }\n\n    function start(dir: -1 | 1): void {\n      // Record BEFORE early-return: the empty-accumulator reset in check()\n      // may have zeroed this during the pre-crossing phase (accumulators\n      // empty until the anchor row enters the capture range). Re-record\n      // on every call so the corruption is instantly healed.\n      lastScrolledDirRef.current = dir\n      if (dirRef.current === dir) return // already going this way\n      stop()\n      dirRef.current = dir\n      ticksRef.current = 0\n      tick()\n      // tick() may have hit a scroll boundary and called stop() (dir reset to\n      // 0). Only start the interval if we're still going — otherwise the\n      // interval would run forever with dir === 0 doing nothing useful.\n      if (dirRef.current === dir) {\n        timerRef.current = setInterval(tick, AUTOSCROLL_INTERVAL_MS)\n      }\n    }\n\n    // Re-evaluated on every selection change (start/drag/finish/clear).\n    // Drives drag-to-scroll autoscroll when the drag leaves the viewport.\n    // Prior versions broke sticky here on drag-start to prevent selection\n    // drift during streaming — ink.tsx now translates selection coords by\n    // the follow delta instead (native terminal behavior: view keeps\n    // scrolling, highlight walks up with the text). Keeping sticky also\n    // avoids useVirtualScroll's tail-walk → forward-walk phantom growth.\n    function check(): void {\n      const s = scrollRef.current\n      if (!s) {\n        stop()\n        return\n      }\n      const top = s.getViewportTop()\n      const bottom = top + s.getViewportHeight() - 1\n      const sel = selection.getState()\n      // Pass the LAST-scrolled direction (not dirRef) so the anchor guard is\n      // bypassed after shiftAnchor has clamped anchor toward row 0. Using\n      // lastScrolledDirRef (survives stop()) lets autoscroll resume after a\n      // brief mouse dip into the viewport. Same-direction only — a mouse\n      // jump from below-bottom to above-top must stop, since reversing while\n      // the scrolledOffAbove/Below accumulators hold the prior direction's\n      // rows would duplicate text in getSelectedText. Reset on drag-finish\n      // OR when both accumulators are empty: startSelection clears them\n      // (selection.ts), so a new drag after a lost-release (isDragging\n      // stuck true, the reason AUTOSCROLL_MAX_TICKS exists) still resets.\n      // Safe: start() below re-records lastScrolledDirRef before its\n      // early-return, so a mid-scroll reset here is instantly undone.\n      if (\n        !sel?.isDragging ||\n        (sel.scrolledOffAbove.length === 0 && sel.scrolledOffBelow.length === 0)\n      ) {\n        lastScrolledDirRef.current = 0\n      }\n      const dir = dragScrollDirection(\n        sel,\n        top,\n        bottom,\n        lastScrolledDirRef.current,\n      )\n      if (dir === 0) {\n        // Blocked reversal: focus jumped to the opposite edge (off-window\n        // drag return, fast flick). handleSelectionDrag already moved focus\n        // past the anchor, flipping selectionBounds — the accumulator is\n        // now orphaned (holds rows on the wrong side). Clear it so\n        // getSelectedText matches the visible highlight.\n        if (lastScrolledDirRef.current !== 0 && sel?.focus) {\n          const want = sel.focus.row < top ? -1 : sel.focus.row > bottom ? 1 : 0\n          if (want !== 0 && want !== lastScrolledDirRef.current) {\n            sel.scrolledOffAbove = []\n            sel.scrolledOffBelow = []\n            sel.scrolledOffAboveSW = []\n            sel.scrolledOffBelowSW = []\n            lastScrolledDirRef.current = 0\n          }\n        }\n        stop()\n      } else start(dir)\n    }\n\n    const unsubscribe = selection.subscribe(check)\n    return () => {\n      unsubscribe()\n      stop()\n      lastScrolledDirRef.current = 0\n    }\n  }, [isActive, scrollRef, selection])\n}\n\n/**\n * Compute autoscroll direction for a drag selection relative to the ScrollBox\n * viewport. Returns 0 when not dragging, anchor/focus missing, or the anchor\n * is outside the viewport — a multi-click or drag that started in the input\n * area must not commandeer the message scroll (double-click in the input area\n * while scrolled up previously corrupted the anchor via shiftAnchor and\n * spuriously scrolled the message history every 50ms until release).\n *\n * alreadyScrollingDir bypasses the anchor-in-viewport guard once autoscroll\n * is active (shiftAnchor legitimately clamps the anchor toward row 0, below\n * `top`) but only allows SAME-direction continuation. If the focus jumps to\n * the opposite edge (below→above or above→below — possible with a fast flick\n * or off-window drag since mode 1002 reports on cell change, not per cell),\n * returns 0 to stop — reversing without clearing scrolledOffAbove/Below\n * would duplicate captured rows when they scroll back on-screen.\n */\nexport function dragScrollDirection(\n  sel: SelectionState | null,\n  top: number,\n  bottom: number,\n  alreadyScrollingDir: -1 | 0 | 1 = 0,\n): -1 | 0 | 1 {\n  if (!sel?.isDragging || !sel.anchor || !sel.focus) return 0\n  const row = sel.focus.row\n  const want: -1 | 0 | 1 = row < top ? -1 : row > bottom ? 1 : 0\n  if (alreadyScrollingDir !== 0) {\n    // Same-direction only. Focus on the opposite side, or back inside the\n    // viewport, stops the scroll — captured rows stay in scrolledOffAbove/\n    // Below but never scroll back on-screen, so getSelectedText is correct.\n    return want === alreadyScrollingDir ? want : 0\n  }\n  // Anchor must be inside the viewport for us to own this drag. If the\n  // user started selecting in the input box or header, autoscrolling the\n  // message history is surprising and corrupts the anchor via shiftAnchor.\n  if (sel.anchor.row < top || sel.anchor.row > bottom) return 0\n  return want\n}\n\n// Keyboard page jumps: scrollTo() writes scrollTop directly and clears\n// pendingScrollDelta — one frame, no drain. scrollBy() accumulates into\n// pendingScrollDelta which the renderer drains over several frames\n// (render-node-to-output.ts drainProportional/drainAdaptive) — correct for\n// wheel smoothness, wrong for PgUp/ctrl+u where the user expects a snap.\n// Target is relative to scrollTop+pendingDelta so a jump mid-wheel-burst\n// lands where the wheel was heading.\nexport function jumpBy(s: ScrollBoxHandle, delta: number): boolean {\n  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n  const target = s.getScrollTop() + s.getPendingDelta() + delta\n  if (target >= max) {\n    // Eager-write scrollTop so follow-scroll sees followDelta=0. Callers\n    // that ran translateSelectionForJump already shifted; scrollToBottom()\n    // alone would double-shift via the render-phase sticky follow.\n    s.scrollTo(max)\n    s.scrollToBottom()\n    return true\n  }\n  s.scrollTo(Math.max(0, target))\n  return false\n}\n\n// Wheel-down past maxScroll re-enables sticky so wheeling at the bottom\n// naturally re-pins (matches typical chat-app behavior). Returns the\n// resulting sticky state so callers can propagate it.\nfunction scrollDown(s: ScrollBoxHandle, amount: number): boolean {\n  const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n  // Include pendingDelta: scrollBy accumulates into pendingScrollDelta\n  // without updating scrollTop, so getScrollTop() alone is stale within\n  // a batch of wheel events. Without this, wheeling to the bottom never\n  // re-enables sticky scroll.\n  const effectiveTop = s.getScrollTop() + s.getPendingDelta()\n  if (effectiveTop + amount >= max) {\n    s.scrollToBottom()\n    return true\n  }\n  s.scrollBy(amount)\n  return false\n}\n\n// Wheel-up past scrollTop=0 clamps via scrollTo(0), clearing\n// pendingScrollDelta so aggressive wheel bursts (e.g. MX Master free-spin)\n// don't accumulate an unbounded negative delta. Without this clamp,\n// useVirtualScroll's [effLo, effHi] span grows past what MAX_MOUNTED_ITEMS\n// can cover and intermediate drain frames render at scrollTops with no\n// mounted children — blank viewport.\nexport function scrollUp(s: ScrollBoxHandle, amount: number): void {\n  // Include pendingDelta: scrollBy accumulates without updating scrollTop,\n  // so getScrollTop() alone is stale within a batch of wheel events.\n  const effectiveTop = s.getScrollTop() + s.getPendingDelta()\n  if (effectiveTop - amount <= 0) {\n    s.scrollTo(0)\n    return\n  }\n  s.scrollBy(-amount)\n}\n\nexport type ModalPagerAction =\n  | 'lineUp'\n  | 'lineDown'\n  | 'halfPageUp'\n  | 'halfPageDown'\n  | 'fullPageUp'\n  | 'fullPageDown'\n  | 'top'\n  | 'bottom'\n\n/**\n * Maps a keystroke to a modal pager action. Exported for testing.\n * Returns null for keys the modal pager doesn't handle (they fall through).\n *\n * ctrl+u/d/b/f are the less-lineage bindings. g/G are bare letters (only\n * safe when no prompt is mounted). G arrives as input='G' shift=false on\n * legacy terminals, or input='g' shift=true on kitty-protocol terminals.\n * Lowercase g needs the !shift guard so it doesn't also match kitty-G.\n *\n * Key-repeat: stdin coalesces held-down printables into one multi-char\n * string (e.g. 'ggg'). Only uniform-char batches are handled — mixed input\n * like 'gG' isn't key-repeat. g/G are idempotent absolute jumps, so the\n * count is irrelevant (consuming the batch just prevents it from leaking\n * to the selection-clear-on-printable handler).\n */\nexport function modalPagerAction(\n  input: string,\n  key: Pick<\n    Key,\n    'ctrl' | 'meta' | 'shift' | 'upArrow' | 'downArrow' | 'home' | 'end'\n  >,\n): ModalPagerAction | null {\n  if (key.meta) return null\n  // Special keys first — arrows/home/end arrive with empty or junk input,\n  // so these must be checked before any input-string logic. shift is\n  // reserved for selection-extend (selectionFocusMoveForKey); ctrl+home/end\n  // already has a useKeybindings route to scroll:top/bottom.\n  if (!key.ctrl && !key.shift) {\n    if (key.upArrow) return 'lineUp'\n    if (key.downArrow) return 'lineDown'\n    if (key.home) return 'top'\n    if (key.end) return 'bottom'\n  }\n  if (key.ctrl) {\n    if (key.shift) return null\n    switch (input) {\n      case 'u':\n        return 'halfPageUp'\n      case 'd':\n        return 'halfPageDown'\n      case 'b':\n        return 'fullPageUp'\n      case 'f':\n        return 'fullPageDown'\n      // emacs-style line scroll (less accepts both ctrl+n/p and ctrl+e/y).\n      // Works during search nav — fine-adjust after a jump without\n      // leaving modal. No !searchOpen gate on this useInput's isActive.\n      case 'n':\n        return 'lineDown'\n      case 'p':\n        return 'lineUp'\n      default:\n        return null\n    }\n  }\n  // Bare letters. Key-repeat batches: only act on uniform runs.\n  const c = input[0]\n  if (!c || input !== c.repeat(input.length)) return null\n  // kitty sends G as input='g' shift=true; legacy as 'G' shift=false.\n  // Check BEFORE the shift-gate so both hit 'bottom'.\n  if (c === 'G' || (c === 'g' && key.shift)) return 'bottom'\n  if (key.shift) return null\n  switch (c) {\n    case 'g':\n      return 'top'\n    // j/k re-added per Tom Mar 18 — reversal of Mar 16 removal. Works\n    // during search nav (fine-adjust after n/N lands) since isModal is\n    // independent of searchOpen.\n    case 'j':\n      return 'lineDown'\n    case 'k':\n      return 'lineUp'\n    // less: space = page down, b = page up. ctrl+b already maps above;\n    // bare b is the less-native version.\n    case ' ':\n      return 'fullPageDown'\n    case 'b':\n      return 'fullPageUp'\n    default:\n      return null\n  }\n}\n\n/**\n * Applies a modal pager action to a ScrollBox. Returns the resulting sticky\n * state, or null if the action was null (nothing to do — caller should fall\n * through). Calls onBeforeJump(delta) before scrolling so the caller can\n * translate the text selection by the scroll delta (capture outgoing rows,\n * shift anchor+focus) instead of clearing it. Exported for testing.\n */\nexport function applyModalPagerAction(\n  s: ScrollBoxHandle,\n  act: ModalPagerAction | null,\n  onBeforeJump: (delta: number) => void,\n): boolean | null {\n  switch (act) {\n    case null:\n      return null\n    case 'lineUp':\n    case 'lineDown': {\n      const d = act === 'lineDown' ? 1 : -1\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'halfPageUp':\n    case 'halfPageDown': {\n      const half = Math.max(1, Math.floor(s.getViewportHeight() / 2))\n      const d = act === 'halfPageDown' ? half : -half\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'fullPageUp':\n    case 'fullPageDown': {\n      const page = Math.max(1, s.getViewportHeight())\n      const d = act === 'fullPageDown' ? page : -page\n      onBeforeJump(d)\n      return jumpBy(s, d)\n    }\n    case 'top':\n      onBeforeJump(-(s.getScrollTop() + s.getPendingDelta()))\n      s.scrollTo(0)\n      return false\n    case 'bottom': {\n      const max = Math.max(0, s.getScrollHeight() - s.getViewportHeight())\n      onBeforeJump(max - (s.getScrollTop() + s.getPendingDelta()))\n      // Eager-write scrollTop before scrollToBottom — same double-shift\n      // fix as scroll:bottom and jumpBy's max branch.\n      s.scrollTo(max)\n      s.scrollToBottom()\n      return true\n    }\n  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