[Use Case Diagram] Moving use cases inside of subjects duplicates the use cases

[planger]

Steps to reproduce:

• Create a subject (i.e. a class) in a use case diagram
• Create a use case inside of the subject
• Move the use case inside of the subject

Expected Result: Use case is graphically moved

Actual result: Use case is duplicated

Note that this seems to be actually a Papyrus bug that has nothing to do with UMLLight. I'm just wondering whether we can either fix it easily in Papyrus or use a different element as a subject to work around this issue.

[cdamus]

It's just the view of the use case that's duplicated, not the semantics. So likely a mistake in one of the diagram's edit-policies.

[cdamus]

Yup, it's a problem in the UsecaseToSubjectInUsecaseDiagramDropStrategy class. I'll work up a fix in Papyrus.

[cdamus]

There's more to this problem besides the duplication. If you drag a use case from outside of a subject into that subject, then a view of the use case is created within the subject but it also remains outside.

[cdamus]

This problem was already reported in the Eclipse bugzilla: bug 535696.