[Bug 786133] qmlglsink: Retain the previous frame to avoid flickering artifacts

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786133

--- Comment #5 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
(In reply to Nicolas Dufresne (stormer) from comment #4)
> Just as a reminder, this is of course a work around, it's not guaranteed it
> will always work. Long term solution would be to add a fence after the
> render, and wait for that fence before releasing.

This is true for both glimagesink and qmlglsink (with this patch applied),
right? I propose this as a workaround until the fence functionality is stable
in mesa. Perhaps some FIXME notes in both sinks as a reminder would be good.

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