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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Err, I correct myself - this is only temporary for dmabuf-based uploaders,
since we can expect that eventually there will be fence support. This is not
true of the Vivante direct texture uploader for example - we'll never have
fences there. So, instead, let's combine them; use fences when possible, and
have this extra buffer as a fallback.

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