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fix(terminal): draw IME preview after local-echo text

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With local echo on, committed text sits in the LocalEchoOverlay and does not
reach the PTY before Enter, so the PTY cursor that places the preview span
stays at the prompt start. The span's z-index 6 only counts inside
.xterm-helpers (its own z-index 5 stacking context), and the overlay is a
z-index 7 layer whose first line is opaque from the prompt column, so every
composition after the first one in a prompt was drawn under the overlay.

- xterm-zerolag-input: add setComposition(text) and a composition getter.
  The overlay draws the composition as an underlined, aria-hidden tail after
  its pending text, through the same wrapping and grow-upward layout. It is
  never part of pendingText, hasPending or anything sent; clear() and
  removeChar() drop it, and rerender()/refreshFont() keep it.
- terminal-ui.js: while local echo shows typed text (on, and not handed back
  to PTY echo by a nav key), render and clear the preview through
  setComposition. The helper span stays for local echo off, and as the
  fallback when the overlay cannot place the text (no prompt found).
- Browser test against real xterm 6, the overlay bundled from its source
  and styles.css: a second composition after pending text is the topmost
  element after that text, and the commit lands in the overlay once. Unit
  tests for setComposition in the package and for the routing in the
  structure test.
- CLAUDE.md and architecture-invariants: state the preview's effective layer.
This commit is contained in:
Aamer Akhter
2026-09-27 07:56:22 -04:00
parent 2d96472dbe
commit ee1a155e2c
9 changed files with 579 additions and 18 deletions
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CLAUDE.md
+1 -1
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@@ -372,7 +372,7 @@ Frontend JS modules have `@fileoverview` with `@dependency`/`@loadorder` tags. L
**SSE staleness watchdog** (`computeSseStale()` in constants.js, `_checkSseStale()` + a 5s interval in app.js): an `EventSource` can stop delivering without erroring, so the client forces a reconnect when nothing arrives. ⚠️ The server keepalive must stay the named `sse:heartbeat` event (`cleanupDeadClients()`, sse-stream-manager.ts), never an SSE comment, which `EventSource` cannot observe; its no-op client listener must stay registered. ⚠️ Judge staleness only while `connected` and online (the loop breaker). ⚠️ The liveness stamp lives inside `addListener`. ⚠️ Clear the interval only at the top of `connectSSE()`, or intervals stack. → [architecture-invariants#sse-staleness-watchdog](docs/architecture-invariants.md#sse-staleness-watchdog)
**Z-index layers** (keep new overlays consistent with this stack): iOS IME composition preview (6, inside `.xterm-helpers`, just under the local echo overlay), local echo overlay (7), terminal touch-selection bar (900, below floating agent windows), subagent windows + split picker menu (1000), plan agents (1100), mobile/tablet fixed header (1200), modals on ≤768px (1300, must beat the fixed header), log viewers (2000), connection-loss overlay (2500), image popups (3000), response viewer (5000, backdrop 4999), file-preview overlay (5100, must outrank the response viewer that launches it), toasts/path picker (10000+), custom-model center-status banner (10001; its `[hidden]` must re-assert `display: none` or `dismiss()` leaves an invisible click-blocker), custom-model swap-confirm/context-warning modals (10010). → [architecture-invariants#z-index-layers](docs/architecture-invariants.md#z-index-layers)
**Z-index layers** (keep new overlays consistent with this stack): local echo overlay (7; with local echo on it also draws the iOS IME composition preview, as an underlined tail after its pending text via `setComposition`), iOS IME composition preview span when local echo is off (6 inside `.xterm-helpers`, whose own z-index 5 is its EFFECTIVE layer, so it sits UNDER the overlay and must never be used while the overlay shows text), terminal touch-selection bar (900, below floating agent windows), subagent windows + split picker menu (1000), plan agents (1100), mobile/tablet fixed header (1200), modals on ≤768px (1300, must beat the fixed header), log viewers (2000), connection-loss overlay (2500), image popups (3000), response viewer (5000, backdrop 4999), file-preview overlay (5100, must outrank the response viewer that launches it), toasts/path picker (10000+), custom-model center-status banner (10001; its `[hidden]` must re-assert `display: none` or `dismiss()` leaves an invisible click-blocker), custom-model swap-confirm/context-warning modals (10010). → [architecture-invariants#z-index-layers](docs/architecture-invariants.md#z-index-layers)
**Respawn presets**: `solo-work` (3s/60min), `subagent-workflow` (45s/240min), `team-lead` (90s/480min), `ralph-todo` (8s/480min), `overnight-autonomous` (10s/480min).