[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 #16 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #15)
> As in, you're not seeing any output because the XMapWindow is being written
> to the request buffer but not being flushed and sent to the X server so the
> server isn't mapping the window.

After add XSync (device, False) after XMapWindow in _show_window(), still
cannot see the color bar and only white screen without my patch. Is there any
other reason for this issue?

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