Hi everybody,

I have the following issue with the SceneGraph and QQuickItem.
I call the update() of my QQuickItem class from a worker thread instead of the 
main thread. There I get sometimes the assert warning, that prevDirtyItem is a 
Null pointer. I looked it up in the source code (qquickitem.cpp) and it seems 
that this has something to do rather with the pure frequence of calling it than 
with a bad synchronization. I have to call the update() method roughly every 
other 20 ms. Has anyone of you gathered some experiences or an idea, how to 
workaround this? Maybe I'm doing it completely wrong.

Thanks a lot.
Greetings
Matthias
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