[Bug 782774] kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782774

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #355015|reviewed                    |needs-work
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--- Comment #15 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Review of attachment 355015:
 --> (https://bugzilla.gnome.org/review?bug=782774&attachment=355015)

I resurrected some ancient resolution change test for v4l2src (which I know is
pretty picky about drain implementation), unfortunately it raised issues,
apparently the video info is out of sync, as a side effect, we can't map
last_buffer anymore. That makes the copy to fail, the buffer to be kept and
finally v4l2src return EBUSY -> not-negotiated.

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