WTreeNode: Wether child-node is selectable depends on parent-node
I have a root WTreeNode and a child-node added via addChildNode. I want the root node not to be selectable and call root~~setSelectable(false); on it. The child-node I want to be selectable, but even calling explicitly child~~>setSelectable(true); leaves the child-node (and furthermore any node in any depth under root-node) unselectable.
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