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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Created attachment 357362
  --> https://bugzilla.gnome.org/attachment.cgi?id=357362&action=edit
qmlglsink flickering artifacts patch

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