Fix exception when dropping an association on a diagram #3383
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This happens due to how transactions are handled. The undo-manager get's confused if more than one transaction is created at a time.
This way we can assure we always have an up-to-date line end.
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PR Type
What kind of change does this PR introduce?
What is the current behavior?
Dropping an association causes an exception.
Issue Number: Fixes #3359
What is the new behavior?
No more exceptions.
Does this PR introduce a breaking change?
Other information