viewer: Use the "realize" GTK callback to asynchronously obtain window handle
This eliminates some race conditions resulting from the use of GstVideoOverlay. Namely, this allows docking the viewer correctly if it was undocked on startup. Note the new style of getting win32 handle.
parent
929e3052
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💬 @bugzilla-migrationmentioned in issue #667 (closed)
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💬 @bugzilla-migrationmentioned in issue #1341 (closed)
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