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fix: resolve terminal resize scrollback ghost renders

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- Switch resize handler to 300ms trailing-edge debounce for single reflow
- Add \x1b[3J (Erase Saved Lines) to clear scrollback reflow debris
- Remove client-side cursor-up flicker filter and DEC 2026 marker
  stripping — xterm.js 6.0 handles synchronized output natively
- Remove server-side DEC 2026 wrapping to prevent premature sync exit
  from non-reference-counted nested markers
This commit is contained in:
zhouyuan
2026-03-12 01:04:21 +08:00
parent 2329dab240
commit 28dfc279d4
3 changed files with 97 additions and 154 deletions
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src/web/server.ts
+7 -8
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@@ -127,8 +127,8 @@ import {
// When terminal supports this, it buffers all output between start/end markers
// and renders atomically, eliminating partial-frame flicker from Ink redraws.
// Supported by: WezTerm, Kitty, Ghostty, iTerm2 3.5+, Windows Terminal, VSCode terminal
const DEC_SYNC_START = '\x1b[?2026h'; // Begin synchronized update
const DEC_SYNC_END = '\x1b[?2026l'; // End synchronized update (flush to screen)
// DEC 2026 sync markers no longer added server-side — xterm.js 6.0 handles
// them natively and Claude CLI already emits its own markers via Ink.
// SSE padding for Cloudflare tunnel buffer flushing.
// Cloudflare quick tunnels buffer small SSE responses, causing lag for real-time events.
@@ -2119,14 +2119,13 @@ export class WebServer extends EventEmitter {
if (chunks && chunks.length > 0) {
// Join chunks only at flush time (avoids O(n^2) string concatenation in batchTerminalData)
const data = chunks.join('');
// Wrap with DEC mode 2026 synchronized output markers
// Terminal buffers all output between markers and renders atomically,
// eliminating partial-frame flicker from Ink's full-screen redraws.
// Unsupported terminals ignore these sequences harmlessly.
const syncData = DEC_SYNC_START + data + DEC_SYNC_END;
// xterm.js 6.0+ handles DEC 2026 synchronized output natively.
// Claude CLI (Ink) already emits its own DEC 2026 markers around redraws.
// Do NOT add an outer wrapper — DEC 2026 is not reference-counted, so
// the inner 2026l would prematurely exit sync mode, defeating the purpose.
// Fast path: build SSE message directly without JSON.stringify on wrapper object.
// Only the terminal data string needs escaping; sessionId is a UUID (safe to template).
const escapedData = JSON.stringify(syncData);
const escapedData = JSON.stringify(data);
// Append tunnel padding for immediate Cloudflare proxy flush —
// terminal data is high-frequency and latency-sensitive.
const padding = this._isTunnelActive ? SSE_PADDING : '';