Topology3D Update:  *Change the hirarchy behaviour from 'extending nodes whenever double-click or press return key' to 'extending only when a node is double-clicked or when a node is selected before pressing return key * Add user warning and tips prompts when wrong operations are detected
Topology3D Update: 
*Change the hirarchy behaviour from 'extending nodes whenever double-click or press return key' to 'extending only when a node is double-clicked or when a node is selected before pressing return key
* Add user warning and tips prompts when wrong operations are detected

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