treeview: Don't handle clicks on any child widgets
We already skip them on the edited cell widget, but it's also a problem for header buttons. Overall, there's no real reason to let it propagate here.
Fixes #3996 (closed)
We already skip them on the edited cell widget, but it's also a problem for header buttons. Overall, there's no real reason to let it propagate here.
Fixes #3996 (closed)