[Bug 732694] glimagesink: handle drain query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732694
  GStreamer | gst-plugins-bad | git

--- Comment #1 from Julien Isorce <julien.isorce at gmail.com> 2014-10-30 18:28:17 UTC ---
I think we need this patch but not sure it still applies with current upstream.
For the story I remember having pushed this in eglglessink but since it has
been removed we need this in glimagesink.

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