[Webkit-unassigned] [Bug 72552] New: Unset the active flag when TextTrackCues go away

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=72552

           Summary: Unset the active flag when TextTrackCues go away
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: annacc at chromium.org
            Blocks: 43668


4.8.10.12.1 Text track model
http://www.whatwg.org/specs/web-apps/current-work/#text-track-cue-active-flag
The active flag
… The user agent must synchronously unset this flag whenever the text track cue is removed from its text track's text track list of cues; whenever the text track itself is removed from its media element's list of text tracks or has its text track mode changed to disabled; and whenever the media element's readyState is changed back to HAVE_NOTHING. When the flag is unset in this way for one or more cues in text tracks that were showing or showing by default prior to the relevant incident, the user agent must, after having unset the flag for all the affected cues, apply the rules for updating the text track rendering of those text tracks. For example, for text tracks based on WebVTT, the rules for updating the display of WebVTT text tracks.

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