Details
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Type:
Bug
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Status: Closed
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Priority:
Not Evaluated
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Resolution: Invalid
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Affects Version/s: 5.15.1
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Fix Version/s: None
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Component/s: Quick: Core Declarative QML , Quick: Graphical Effects
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Labels:None
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Platform/s:
Linux/X11,
macOS,
Windows
Description
After experiencing some crashes in our app, using Qt 5.15.1, I found causing component.
It is the ColorOverlay component from QtGraphicalEffects.
The ColorOverlay was created in the main window and then reparented with a bunch of other components to a different window. By reverting and repeating the process of reparenting, the app crashes at some point
After reparenting the items, there are some warning messages:
QQuickItem: Cannot use same item on different windows at the same time.
I recreated the behavior in a small test application and tried to work around the crash with a Loader. It only doesn't crash, if I connect to the windowChanged signal of the top level Item, to deactivate and activate the Loader during the reparenting process. If I only reparent the item without deactivating the Loader, the app crashes after I resize the new window.
Additionally I noticed that a component, which uses a GraphicsEffect like ColorOverlay, when loaded via a Loader it causes graphical artifacts, when the window is resized (maybe another Bug?).
Previously we used Qt 5.10.1 and the warning messages also appeared, but it didn't crashed.