Closing an episode context menu (or its Rate / File Info sheets) on a
show opened from a Home section scrolled the detail page back to the
top, and on shows with many seasons jumped the season selector back to
the entered-from season. The Home path parks invisible focus on the
initial episode/season target; dismissing the menu restored focus to
that parked node, whose focus-gain auto-scroll then yanked the viewport.
Focus chrome is already keyboard-mode-only, so make the focus-gain
reveal match: FocusableWrapper, FocusableChipStateMixin, and
FocusableTileStateMixin now scroll into view only during keyboard/D-pad
sessions. The gate reads the tracker's live state (new
InputModeTracker.currentMode) because the inherited provider is one
frame stale on the first navigation key of a session. The touch OSK
search submit keeps its jump-to-results via an explicit reveal, matching
the existing pointer-mode convention of pairing requestFocus with an
explicit scroll.
close#2031
Profile traces showed 100-370ms UI-thread frames while scrolling the
library screen, dominated by rebuilding and inflating media cards.
- Gate per-card focus/pointer chrome on input mode: FocusableWrapper
skips the scale/border wrappers and creates its AnimationController
lazily outside keyboard mode, and ClickableCursor plus the card tap
region only build MouseRegion/InkWell machinery on desktop - TV and
touch use a bare GestureDetector. Hub cards also drop their outer
gesture wrapper outside keyboard mode; the card's own tap region
always won the gesture arena anyway.
- Memoize sliver children (SliverChildMemo): browse/collections grids
and hub rows return identical widget instances for unchanged items,
so delegate swaps from pagination, watch-state, and deletion
setStates no longer rebuild every realized card inside layout. The
browse tab prunes the memo in lockstep with focus-node eviction so a
cached card can never resurrect a disposed FocusNode.
- Budget fresh inflation (CardInflationBudget): while a scrollable is
moving in pointer/touch mode at most one new card inflates per frame,
the rest render as SkeletonMediaCard and upgrade on following frames.
Hub rows also stop pre-inflating 250px of off-screen cards on entry.
Device traces: worst frame 373ms -> 103ms, per-card build 3.6ms ->
2.4ms median; remaining row-entry work is spread across frames.
edde746