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1f403f815d
**The diagnosis:** The issue arrises from the fact that while the original object is subscribed to be validated, that subscription is only created by setting it as a settings override object. A clone of that object, while still a settings-override object, never gets subscribed because it's not explicitly set with the tool. **The solution (?):** I moved all the validation stuff over to SettingOverrideDecorator.py, and use its onSettingChanged() function to trigger the validation. Unfortunately, I can't use the timer because of some limitation with QTTimer and threads. So it's _a bit laggy in some places, and I'd be open to tips about how to fix this. It does work reliably though.