[Bug 766704] vaapi: sharing display handle between app and vaapi elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766704

--- Comment #28 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 356420
  --> https://bugzilla.gnome.org/attachment.cgi?id=356420&action=edit
vaapisink: fail if surface display is different

Replacing GstVaapiDisplay during rendering might be hiding problems
at some cases, even though it's safe currently since we use cache
of GstVaapidisplay.

Play safe by failing if this happens.

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