[Bug 701109] New: videomixer: z-ordering breaks if pads are added without setting zorder on it

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701109
  GStreamer | gst-plugins-good | git

           Summary: videomixer: z-ordering breaks if pads are added
                    without setting zorder on it
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The z-ordering is not correct if pad are added after having configured the
z-ordering. To reproduce:

1) Request pad1 and set zorder to 2
2) Request pad2 (don't change z-order)

One can use this pipeline:
gst-launch-1.0 videotestsrc ! mix. videotestsrc ! mix. videomixer name=mix
sink_1::xpos=100 sink_0::ypos=100 sink_0::zorder=2 !
video/x-raw,width=420,height=340 ! videoconvert ! xvimagesink

As default z-order is the pad number, it is expected that botton left (sink_0)
is on top, as it has zorder=2 and sink_1 has zorder=1.

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