Nothing sat between the full-screen `RasterizedGradient` scrim and the
position-driven leaves, so `markNeedsPaint` from the timeline slider walked past
the gradient and re-rasterized the entire chrome -- top bar, button row,
timestamps, timeline -- on every 250 ms position tick. That also partly defeated
`RasterizedGradient`, which exists because Skia gradients cost ~10 ms per
full-screen pass on this GPU class.
Around that, four things drove root `setState` calls that only needed to change a
leaf:
- Held D-pad seek called a root `setState` per key repeat, even when the readout
was already visible in the same direction and only the accumulated seconds had
changed. The seek amount now flows through a `ValueNotifier` that
`DoubleTapFeedback` reads, so a burst updates one `Text`.
- `DoubleTapFeedback`'s drift chevron ran `..repeat()` with no stop condition, and
kept ticking at 60 Hz for the ~300 ms the readout spends at zero opacity after
every burst. The controller is now gated on visibility.
- The auto-skip countdown ran a 5 Hz timer that root-`setState`d the controls tree
for the whole intro/credits window, to animate one progress ring.
- The play-next and still-watching countdowns root-`setState`d the player screen
once a second, which re-created `PlexVideoControls` with its ~50 props and
rebuilt the entire chrome to change one digit. Prompt open/close deliberately
stays on the state path, because `playNextFocusNode` is threaded through those
props and D-pad focus depends on it.
Two of the four position subscribers existed only to recompute pointer-hover
tooltips that a D-pad viewer never sees, rebuilding a button subtree 4x/s and
rescanning the chapter list each time; the "ends at" readout reformatted a string
4x/s for a value that changes once a minute. All three now dedupe.
Finally, the buffer path did two sequential `copyWith` calls on a 15-field
`PlayerState` and handed `BufferRangePainter` a freshly allocated list every tick.
`List` has no value equality, so `shouldRepaint` was unconditionally true.
Measured on device during playback with the chrome raised: 6 of 344 UI frames over
budget, p50 4.39 ms, layout p90 1.09 ms. During a held D-pad seek -- the worst
frame-time window on the TV path, because the readout and the decoder flush land in
the same frames -- 1 of 354 frames over budget, p50 4.28 ms, zero raster frames over
budget.
Use GappedTrackShape (no stop indicator) globally.
Timeline/volume sliders get local overrides for thinner
track, zero padding, and no overlay. Chapter markers
rendered as track gaps. Live TV timeline matches style.
Timeline thumb hidden when unfocused in dpad mode.
edde746