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I need to make a copy of a diagram. I selected a diagram (e.g. a class diagram), selected Edit->Copy then selected the "Model" node of the project and selected Edit->Paste. Nothing happened. The diagram copy should be created or at least an error message why the diagram copy could not be created should be displayed.
Unfortunate, copy / paste diagram in this fashion is not yet supported. However, you can invoke 'Save As' on the diagram node and move the copy around by DnD.
Since copying diagram has not yet been supported, this should be an enhancement issue instead.