Activate the semantic DnD on the header of the container
We need to allow the semantic DnD of element on the header of the container in addition of the DnD on the target compartment itself. For example, on the class Diagram, the user want to be able to drop an Operation directly on the header of the Class. Currently it is not possible, the user need to do its drop the OperationCompartment.
This behavior must be implemented on these diagrams:
- Class
- Composite Structure
- Package
- State Machine