[Bug 763732] glwindow: no video frame when use QT created window on X11

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763732

--- Comment #12 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
What??  That makes no sense whatsoever...unless the writes aren't making it to
the X server?  Try adding an XSync (device, False) after XMapWindow in
_show_window().

Another data point, GST_DEBUG=glwindow*:6, get the internal window handle from
the debug line, "glwindow
gstglwindow_x11.c:243:gst_gl_window_x11_create_window: gl window id: xxxxx"
(without the 'd' at the end), and while that's running pass it into xwininfo
-id xxxx and see what that says about the window (and maybe the parent window
as well).

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