[Bug 638168] textoverlay: don't return wrong-state when stopping while in text chain

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=638168
  GStreamer | gst-plugins-base | unspecified

--- Comment #17 from Sebastian Dröge <slomo at circular-chaos.org> 2012-05-11 08:33:16 UTC ---
Flush-stop should clear the wrong-state on the queue elements

The subtitle specific flush is supposed to flush the current subtitle from the
video. This is e.g. necessary if you currently display a subtitle that will be
displayed for the next two minutes to allow switching to the newly selected
subtitle stream before the duration of the previous buffer finished.

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