Yeah, auto-deleting underlying widget when tree item is removed, seems expected/reasonable behavior by default for me. I'm a bit surprised, that it is not.

(So, when the whole tree is deleted, the custom widgets in tree items still live... ??? ).

Will try your solution, seems a bit better workaround...

The reason why this happens is because the button is not deleted when the tree item is removed. It's invisible, but it's still there.

Why so? OK, I understand that the button is not deleted, however I'd not expect, that it will receive clicks, when it's container (tree-item) is deleted/removed.

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