Stopping HDR playback with frame rate matching enabled left some TVs
black for up to 30 seconds. The teardown reset preferredDisplayModeId
while the display was still signaling HDR, folding the HDR exit and the
refresh-rate restore into one HDMI renegotiation that slow sink chains
take many seconds to complete (8.5 s on a Shield Pro with an HDR10
display; ~30 s on the reporter's DV AVR+TV chain). Sequenced, the HDR
infoframe clear is free and the SDR mode switch takes about a second.
FrameRateManager.clearVideoFrameRate now takes an hdrActive hint from
the core (mpv: the content-color-transfer decision; ExoPlayer: the
selected track's colorInfo transfer) and defers the restore by 400 ms so
the surface teardown commits the HDR exit first. The deferred restore
lives on its own main-looper handler because core dispose clears the
shared player handler wholesale, and a new setVideoFrameRate cancels it
so a fresh session's switch is never clobbered. SDR teardown behavior is
unchanged.
Verified on a Shield Pro (mpv backend, 1917 DV P8/TrueHD, Jellyfin):
link recovery after stop went from ~8.5 s to ~0.8 s, with the SMPTE 2086
clear now committing before the mode set.
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