[Bug 795836] New: compositor: Cross-fading mode requires alpha output but does not renegotiate if cross-fading is selected

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795836

            Bug ID: 795836
           Summary: compositor: Cross-fading mode requires alpha output
                    but does not renegotiate if cross-fading is selected
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: alexandru.balut at gmail.com, nirbheek.chauhan at gmail.com,
                    tsaunier at gnome.org
        Depends on: 784827
     GNOME version: ---

+++ This bug was initially created as a clone of Bug #784827 +++

See summary. If cross-fading is selected at a later time, no renegotiation will
be triggered and non-alpha output would be generated.

It is only setting the needs_alpha flag on the pad, which is read the next time
renegotiation is happening.

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