SUMMARY
When an association is created by dragging the related icon from an actor to a use case, or to another actor, two XMI elements are added to the file:

1) The element which has the tag <UML:Association> along with the owned elements <UML:Association.connection> and <UML:AssociationEnd>;

2) The element <associations>, previously empty, is given child elements with the tag <assocwidget>.

But when the associations are deleted in the diagram, only the elements under the <diagram> element are deleted; the model elements tagged <UML:Association> are left behind as zombies.


STEPS TO REPRODUCE
1. In Umbrello, create an actor and two use cases;
2. Draw associations between the actor and the use cases.
3. Save the file. Open it in an editor and verify that the elements described above were created.
4. In Umbrello, delete the associations just drawn and save the file again.

OBSERVED RESULT
Notice that the elements tagged <UML:Association> were not deleted, only the <assocwidget> elements under <diagram> were deleted.


EXPECTED RESULT
All elements corresponding to the deleted associations should have been removed from the XMI file.

SOFTWARE/OS VERSIONS
Linux Ubuntu 18.04.4
Qt Version: 5.x

ADDITIONAL INFORMATION