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Codeman/test
Codeman maintainer a80eda8e4c fix(mobile): make every session tab reachable in the tab strip (#257)
With five tabs open on a phone, the right-hand tabs were effectively
unreachable. Selecting a tab only toggled the .active class, so the strip
never moved, and every full rebuild (a task badge appearing, a session
created elsewhere) replaced the strip's innerHTML, which resets scrollLeft
to 0 and yanked a mid-swipe strip back to the first tab.

Three changes, which only work together:

* computeTabScrollLeft() (pure, constants.js) decides the scroll target from
  measured rects, and _scrollActiveTabIntoView() applies it on selection.
  Rect math on the strip's own scrollLeft rather than scrollIntoView(), which
  also scrolls ancestors: on a phone that is the document, under a fixed
  header and possibly an open keyboard.
* _fullRenderSessionTabs() saves and restores scrollLeft across the rebuild,
  and re-reveals the active tab only when it actually changed
  (_lastRenderedActiveTabId), so a background render never undoes a manual
  swipe.
* Mobile no longer hoists the active session to the front of the strip. That
  reordering ran on full renders only, so tab order flipped depending on
  which render path fired, and it renumbered the Alt+N badges. Scrolling the
  active tab into view replaces it.

Also sets overscroll-behavior-x: contain on the strip so a swipe that runs
past the last tab stays in the strip instead of becoming the browser's back
gesture.

Tests: scroll-target math in test/tab-overflow.test.ts (runs in CI), plus
five browser regressions in test/mobile/tabs.test.ts covering reveal-on-
select in both directions, scroll preservation across an ambient rebuild,
sessionOrder rendering on phones, and a real touch drag reaching the last
tab.

Closes #257

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-10 03:06:23 +02:00
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