Files
Codeman/test
Codeman maintainer 6866a617a8 fix(terminal): stop the backpressure refresh yanking and shrinking the buffer
Two further instances of the same root cause, both in _onSessionNeedsRefresh,
which is SERVER-triggered (it fires after SSE backpressure clears) so the user
has no gesture to blame the result on.

1. It ended in an unconditional scrollToBottom, so a user quietly reading
   scrollback was dropped to the live output by a background event. It now
   holds their place. The rewrite REPLACES the buffer, so an absolute viewportY
   captured beforehand is meaningless afterwards; distance from the bottom is
   the anchor that survives, via computeRewriteScrollLine().

2. It rebuilt the terminal from a 1MB TAIL. Measured end to end on a 900-line
   shell pane: an 869-row buffer came back as 158 rows, so the refresh meant to
   REPAIR the display was destroying most of the scrollback every time it ran.
   It now asks for full history, and falls back to the tail only when
   _replayWouldShrinkBuffer refuses the capture, which keeps repaint-mode panes
   (tmux holds roughly one frame for them) exactly as they were.

Also records truncation state here, so the #258 banner stops describing the
pre-refresh buffer.

Verified in a real browser against a live session: baseY 869 -> 869 where it
used to be 869 -> 158, a reader 200 lines up stays 200 lines up, and a follower
stays pinned to the bottom.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-14 00:51:58 +02:00
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