[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 #8 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2012-03-12 17:07:12 UTC ---
For the record, this case can also happen when seeking.

Video and text pads are set to flushing, the current text is popped, and the
lock signal broadcast. This wakes up the text chain, which founds both pads
flushing and returns wrong-state.
This causes the (playbin2) queue upstream to panic and stop.

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