[Bug 766520] gl: win32: race when handling window messages while creating the internal window

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766520

--- Comment #2 from Xavier Claessens <xclaesse at gmail.com> ---
Digging more the issue, it seems to be a active/focus window issue. If I
understand correctly, when creating internal window with no parent it receives
WM_ACTIVATE and WM_SETFOCUS, but since it has no parent yet, those msg are not
forwarded to parent window, and thus parent window loses its focus. When
parenting the internal window, it won't transfer focus to parent magically, and
since an internal window cannot have focus, nobody has focus.

Switching to another window with alt-tab then getting back to gstreamer's
window give focus back.

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