[Bug 786246] qmlglsink: Add itemInitialized signal

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786246

--- Comment #3 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
None that I've found. There is sceneGraphInitialized(), but it is emitted by
the window, and suffers from the race condition I described. From what I've
seen, it is *not* common for a QQuickItem to grab the context like qmlglsink
does. The basic problem is that in Qt5, the scene graph and the QML tree are
not always in sync, and other than this signal, I see no clean way of knowing
when autoplay can be done. Also note what I wrote about it being futureproof.
If you rely on other signals that were not designed for this purpose, you might
risk regressions later on.

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