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Author SHA1 Message Date
peter f8a31d48cf fix(ui): a dialog keeps the focus it was given, and hands it back where it took it from
Round 5 extracted `ui/dialogFocus` so no shell would hand-roll the focus
contract, then introduced four ways to lose the focus anyway — all four measured
in jsdom against the real components.

**Ownership was narrower than the trap.** `ui/Modal` traps Tab over the whole
dialog on purpose, so a toast's Undo or ✕ stays reachable; ownership was tracked
over the panel alone. Tabbing to that ✕ therefore read as "the user left the
dialog", and since removing a toast fires no `focusin` to re-arm, closing
afterwards skipped the restore and left the focus on <body>. Before this hook
existed the restore was unconditional, so it was a regression.

**A dialog stacked above us is still ours.** A nested `ui/Modal` portals into its
own host, so it is outside the outer dialog's root however wide that scope is
drawn — widening alone could not fix it. Both closing in one commit left the
focus on <body>: the outer skipped its restore, and the child's own target (a
control inside the outer panel) was already detached, because passive cleanups
run parent-first. Ownership now means "inside my dialog, or inside a modal layer
above it", which is what the rule always intended.

**The wizard disagreed with `ui/Modal` on its first line.** `trapTab(e, panel)`,
with neither the dialog-root scope (so its own toast host was outside the cycle
— the connection notice never auto-dismisses, and its ✕ was unreachable from the
keyboard) nor the `container` argument the JSDoc exists for: `panel.contains(
panel)` is true, so focus sitting ON the tabIndex=-1 panel matched no branch and
a Shift+Tab walked into the app behind the scrim. Both call sites now pass the
same three arguments.

**The toast handover was a render-phase read-modify-write.** A `useMemo` read a
module global that the next line overwrote; React re-invokes a component body
and every `useMemo` factory in it on a StrictMode double render, and the LAST
invocation commits — so the second pass re-read what the first had just written,
the takeover host classified its OWN new toast as inherited, and the dev build
behaved exactly like the code round 5 replaced. Snapshotted through a ref keyed
on `isTop`, so a repeated invocation of one render is a no-op.

And the fourth `aria-modal` shell, `Welcome`'s screenshot lightbox, is finally
swept into the same contract: it declared itself a modal dialog while leaving
the focus on the thumbnail behind an 80%-black scrim and letting Tab walk the
landing page underneath.

The headline fix of the previous commit — StrictMode's re-mount taking the focus
off an `autoFocus` field — had no test at all; deleting it left all 1009 green.
It has one now.

9 tests, mutation-checked against 8 mutations, each red on the test that names it.
2026-09-12 05:49:58 +02:00
peter 41b652f8fd fix(ui): a dialog opens focused where it said it would, and the wizard is a dialog
Deep-review round 5, over round 4's own fixes.

- Round 4 gave `ui/Modal` a persistent portal host so a fullscreen transition would stop tearing
  the dialog down. The host was attached in a `useLayoutEffect` — one commit phase AFTER React
  runs `autoFocus` in `commitMount`, and `focus()` on a disconnected node is a no-op. Every
  autoFocus in every dialog was dead: Mod+K opened the command palette with the focus on the ✕,
  so typing searched nothing and Enter closed it; the same for the download rename field and
  every non-danger confirm. The host is attached in a `useInsertionEffect` now, a whole phase
  earlier, and the whole re-parent — including the focus save/restore across the move, which
  `appendChild` needs because it is remove-then-insert — lives in one `useFullscreenPortalHost`.
  `ui/AnchoredPopover` had a second copy of that re-parent WITHOUT the focus restore, and a
  comment claiming focus survived it; both now come from the hook.

- `ui/Toaster` classified a toast raised in the SAME commit as a host takeover among the ones it
  inherits, because it read the store live at the takeover render. A dialog that notifies and
  closes in one handler (UploadDialog) therefore put its toast up with no role, into a region
  still `aria-live="off"` — announced by neither path. "Inherited" is now what the outgoing host
  last had on screen, and a toast that is NOT inherited is announced even inside the unarmed
  window.

- The onboarding wizard renders its own shell, and Escape ordering was all of the dialog contract
  it had: no role, no label, no initial focus, no trap, no restore. A keyboard user tabbed out of
  the first-login wizard into the app behind the scrim. The focus half of the contract is now one
  shared `ui/dialogFocus` that both `ui/Modal` and the wizard use.

Every fix has a regression test, each mutation-checked (6 mutations, all red on the assertion
they are named after).
2026-09-12 03:41:37 +02:00