[Bug 759801] gltestsrc outputs only black frames for pattern 0 and 11

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759801

--- Comment #7 from Reynaldo H. Verdejo Pinochet <reynaldo at opendot.cl> ---
No I'm not working on the main issue here. I see two
separate problems:

A) Missing tests pattern implementations or prop-set failure
   paths for unsupported ones. I had this on my TODO but looks
   like most of it is handled by #751540

B) Wrong, gltestsrc-incompatible GL3 default on glimagesink
   chosen before proper negotiation can take place. This regression
   was introduced by Matthew with
   70be81ad922195edba469dface08637136edd4a9 "glimagesink: create a
   context in NULL_READY"

I'm keeping an eye on "A" but I'm not working on "B", the
actual bug. Maybe reverting the offending commit is enough?

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