The Dolby Vision and Hi10 decode policies run in mpv's on_preloaded hook,
before track selection, and read the first demuxed video track. A file whose
first video track is not the one mpv picks (attached pictures, a
default-flagged second track, --vlang, an explicit vid) got the wrong
routing.
The hook now resolves one pending track for both policies: an explicit
vid=no or vid=N is authoritative on its own, and auto asks the fork's
pending-vid property, which runs mpv's own default selection ahead of time.
On a libmpv without that property the first-track guess stays, logged once.
The predecoder gate is unchanged (#2065). The fork patch lands separately
through the native pin flow.
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