[Bug 775045] New: gtkglsink: re parenting the video widget into a different toplevel does not work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775045

            Bug ID: 775045
           Summary: gtkglsink: re parenting the video widget into a
                    different toplevel does not work
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: juanpablougarte at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 340711
  --> https://bugzilla.gnome.org/attachment.cgi?id=340711&action=edit
Simple test case

Reparenting the video widget from gtkglsink to a different toplevel does not
work because the GdkGLContext is different and GtkGstGLWidget uses the old one.

This is needed to implement fullscreen for example.

Ideally GtkGstGLWidget should get the context in the realize event and free it
on unrealize if possible.

Attached a simple test case that toggles fullscreen mode on key release

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