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codex/codex-rs/tui2
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Josh McKinney 279283fe02 fix(tui2): avoid scroll stickiness at cell boundaries (#8695)
Mouse/trackpad scrolling in tui2 applies deltas in visual lines, but the
transcript scroll state was anchored only to CellLine entries.

When a 1-line scroll landed on the synthetic inter-cell Spacer row
(inserted between non-continuation cells),
`TranscriptScroll::anchor_for` would skip that row and snap back to the
adjacent cell line. That makes the resolved top offset unchanged for
small/coalesced scroll deltas, so scrolling appears to get stuck right
before certain cells (commonly user prompts and command output cells).

Fix this by making spacer rows a first-class scroll anchor:
- Add `TranscriptScroll::ScrolledSpacerBeforeCell` and resolve it back
to the spacer row index when present.
- Update `anchor_for`/`scrolled_by` to preserve spacers instead of
skipping them.
- Treat the new variant as "already anchored" in
`lock_transcript_scroll_to_current_view`.

Tests:
- cargo test -p codex-tui2
279283fe02 ยท 2026-01-03 20:26:40 +00:00
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