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fix: prevent duplicate terminal output on tab switch to busy sessions

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Two fixes for the tab-switching corruption bug:

1. _finishBufferLoad() now discards queued SSE events instead of flushing
   them. The loaded API buffer is the source of truth — queued events
   overlap with it, and flushing them writes duplicate Ink cursor-up
   redraws that corrupt the terminal display (garbled text, wrong cursor
   positions).

2. Skip stale cache write for busy sessions. When a session is actively
   working, the cache is always outdated — writing it first and then
   rewriting with the fresh API buffer caused a jarring double-render
   flash. Now busy sessions get a single clean clear+write transition.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-03-23 12:32:33 +01:00
co-authored by Claude Opus 4.6
parent a9d83ec4e3
commit 0d80524f10
2 changed files with 22 additions and 14 deletions
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src/web/public/terminal-ui.js
+7 -7
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@@ -1109,18 +1109,18 @@ Object.assign(CodemanApp.prototype, {
},
/**
* Complete a buffer load: unblock live SSE writes and flush any queued events.
* Complete a buffer load: unblock live SSE writes.
* Called when chunkedTerminalWrite finishes (or is skipped for empty buffers).
*
* Queued SSE events are DISCARDED, not flushed. The loaded buffer from the API
* is the source of truth up to the response timestamp. SSE events queued during
* the fetch+write overlap with the buffer — flushing them writes duplicate data
* (especially Ink cursor-up redraws), corrupting the terminal display.
* After unblocking, new SSE/WS events deliver subsequent output normally.
*/
_finishBufferLoad() {
const queue = this._loadBufferQueue;
this._isLoadingBuffer = false;
this._loadBufferQueue = null;
if (queue && queue.length > 0) {
for (const data of queue) {
this.batchTerminalWrite(data);
}
}
},