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Fixes #1616. Supersedes the soften-and-track approach from #1172 (now closed). ## What Architectural fix for the slide-over close path so it no longer transitions through a `focused-but-hidden` state. Chromium-headless cannot deterministically order focus/blur events when `panel.hidden = true` happens in the same microtask as a delegated table re-render — root cause of the flake family that was blocking ~8 unrelated PRs at a time and flipping master CI ~50%. ## How (three changes per #1616 acceptance criteria) 1. **Panel detach on close.** `open()` attaches panel + backdrop to `<body>`; `close()` removes them. `isOpen()` is now a boolean flag (`panelOpen`) instead of `(!panel.hidden)` — the closed panel literally does not exist in the document tree, so there is no focused-but-hidden window. 2. **Focus restore by `data-value` lookup at restore time.** Sync `tr.focus()` BEFORE detach. If `document.activeElement !== tr` after the sync call, attach a one-shot `MutationObserver` on the table's `tbody`; on a matching row re-attach, call `.focus()` once and `disconnect()`. Observer has a 2s timeout fallback so it doesn't leak when the row is genuinely gone. 3. **Permanent CI flake-gate.** New step in `.github/workflows/deploy.yml`: runs `test-slideover-1056-e2e.js` 20 consecutive times. Any single non-zero exit aborts. If this step ever turns red post-merge, the focused-but-hidden state has crept back in. ## Hard-asserted (no more soft-warn) All three deferred assertions are now `assert(...)`: - `focus-restore@800: Escape returns focus to originating row` - `focus-restore@800: X-button click returns focus to originating row` - `resize@800→1440 nodes: cleanup releases panel, backdrop, scroll-lock, focus` (focusRestored portion) ## Commits - `fce39304` — RED: un-skip the two soft-skipped assertions - `cead78df` — GREEN: architectural fix (detach + MutationObserver) - `4f6d5c47` — CI: permanent `--repeat-each=20` flake-gate ## Verification The 20-run gate is the verification. Watch the new `Slide-over E2E flake-gate (#1616, --repeat-each=20)` step on this PR's CI; merge only if it passes. ## Why this is the right fix Five prior patches (`7891b70`, `366af4f`, `36ebecc`, `df5397f`, `d681505`) all targeted the focus call ordering and all flaked in CI Chromium-headless. The unfixable bit is "hidden-but-was-focused" — Chromium reorders blur/focus across that transition non-deterministically. Removing the transition (detach instead of hide) removes the race entirely. Closes #1616. Closes #1172 (already closed). --------- Co-authored-by: openclaw-bot <bot@openclaw> Co-authored-by: CoreScope bot <bot@corescope.local> Co-authored-by: clawbot <bot@clawbot.local>