[Bug 755675] New: gtkglsink: UI freezes when the window has a GtkHeaderBar and runs on top of X11

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755675

            Bug ID: 755675
           Summary: gtkglsink: UI freezes when the window has a
                    GtkHeaderBar and runs on top of X11
    Classification: Platform
           Product: GStreamer
           Version: 1.6.0
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ianbrunelli at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 312216
  --> https://bugzilla.gnome.org/attachment.cgi?id=312216&action=edit
Python implementation

I've a problem with gtkglsink in my app, which uses a GtkHeaderBar as its
titlebar. Under Wayland it works as it should, but under X11 the UI is in a
weird state: it doesn't load the video (the sound plays, and if you unfocus and
refocus the window a frame is displayed) and it doesn't change visual for
states in widgets (like hovering), although they're responsive (respond to
clicks, for example). If you remove the HeaderBar from the code, the video
works as expected.

In the attachment, you can see a simple Python code that triggers the issue on
my computer.

I've talked with some people on the irc channel and we came to the conclusion
that it may be related to my video driver/card: Gallium 0.4 on AMD PALM (DRM
2.43.0, LLVM 3.7.0).

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