Plex Web reads only the `selected` flag PMS stamps on each stream; the
account's autoSelectSubtitle is applied server-side when that flag is
computed. Plezy's Priority 2 already trusts the same flag, but once
playback read AccountPreferences the Plex mode became non-null and could
reach the client-side profile pass whenever there was no media info or no
embedded subtitle streams - forcing subtitles off for Plex's 0 ("manually
selected") or on for 2, over a decision the server had already made.
TrackSelectionService now skips the profile subtitle mode for Plex items;
MediaBrowser keeps it because those servers do not pre-select.
edde746
51beb5ac4b