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Codeman/test
Codeman maintainer 4ee382832a fix(tabs): keep the active tab in view when it changes state band on a phone
On phones and 600-767px tablets the header strip stays one horizontally
scrolling row. #538 (Tab Layout, default "by state") orders that row in one
flex `order` band per state, so when the ACTIVE session changes state (a
prompt sent: idle to working; a permission prompt: needs you) its chip
moves to another band while scrollLeft stays put, and the tab in use left
the screen (measured at 390px: x 165 to -870). #257's reveal rules only
covered a CHANGED active tab: _updateActiveTabImmediate reveals on a
switch, and _fullRenderSessionTabs restores scrollLeft and re-reveals only
when _lastRenderedActiveTabId changed, while a state change is an
incremental pass that never reveals at all.

_noteActiveTabBand() records the active tab's band (read off the element,
so it is what is on screen) and reports when it moved while the tab stayed
active. Both render paths reveal on that, in the single scrolling row only
(_isScrollingTabRow: not wrapping, not a vertical list). It is keyed on the
band, not the raw order value, because another tab entering or leaving the
active tab's band shifts that value by one and another tab's move must not
yank a strip the user is browsing. _updateActiveTabImmediate records too,
so the pass right after a switch still counts (viewing a waiting tab spends
its alert and drops it into the idle row). The incremental path reveals
after updateTabOverflowMode(), and only from the branch that reached
_syncTabTriageChrome(), so a pass that falls through to a full rebuild
mid-loop leaves the record for the rebuild to compare.

Tests in test/tab-triage.test.ts pin the reveal on both paths and after a
switch, and that another tab's band change, a wrapping strip, a vertical
list and an active web tab never scroll.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-08 21:36:06 +02:00
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