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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Makes sense. However, I compared glimagesink and qmlglsink'S propose_allocation
vfuncs, and both issue calls like:

  gst_query_add_allocation_pool (query, pool, size, 2, 0);

Shouldn't this then be 3 instead 2 for both sinks?

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