[Bug 744816] VideoNode::setCurrentFrame() material assert fails after updating QStandardItemModel

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744816

--- Comment #2 from Randy Spruyt <randy.spruyt at christiedigital.com> ---
"I can set the x position manually in QML just fine. The video plays fine.
However when we bind the x position in XML to the model role, updating the x
position is triggering an event that causes the video node to be destroyed
somewhere. i.e."

typo, I can set the x position manually in C++ just fine. When we bind x to a
QML object, changing the x value triggers a dataChanged() event for the
VideoSceneModelRole_openGLsurface role as well. 

If you manually supress signals in QStandardItemModel::setData(), i.e.
blockSignals( true );

and emitDataChanged() manually without the VideoSceneModelRole_openGLsurface,
we can work around the problem. 

To boil down the issue, the QGst::Quick::VideoSurface object (usually) crashes
when it attempts to handle a dataChanged() event.

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