BUG: Fixed update of imported nodes in subject hierarchy
Changing property (name, visibility, etc.) of any nodes that were loaded from a scene did not cause update of the subject hierarchy item.
How to reproduce: go to Data module, load this scene, switch to "All nodes" tab, rename "LeafletSegmentation" to "abc", switch back to "Subject hierarchy" tab => ERROR! "LeafletSegmentation" node name is not updated.
The problem was that node modification observers were not added for imported nodes.