Deep review of the debt burn, each measured in Chrome:
- Back from a sub-view whose focused control the swap removed: the focus keeper put the focus on a
stand-in (the returning list's first item) and `restoreNavPosition`, finding the focus "already
somewhere", gave up — Plex show → Back landed on tile 0, not the tile it was opened from. A
stand-in the keeper placed now counts as untouched, like <body>. The keeper's walk up also stops
at its container: a slot left with nothing focusable no longer sends the focus to the first
control of the whole document.
- DataTable enabled both layouts' keyboard lists with the same flag, and `useListNav` reads its ref
only when the flag changes: after a resize across `md`, the layout that mounted was never
registered (no j/k) and the one that left stayed registered. Each is enabled with its layout.
- A Plex playlist nests blocks and each show's episodes in one DndContext; closestCenter and the
keyboard coordinates weighed every droppable, so a movie landed "over" an episode — announced as
a place in the other list, dropped somewhere else or nowhere. `sameListCollision` and
`sameListKeyboardCoordinates` keep a drag among its siblings; onDragEnd's episode → block
resolution is gone with the case.
- dnd-kit reports the item over itself in the pick-up's own tick; announced, "moved to position 1"
replaced "picked up … use the arrow keys" before a screen reader read it.
peter
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