0004759: Create subtype changes the roles for related facttypes without indicating this
Description
Create Subtype has side-effects that are not displayed: it changes the role underwater, without displaying the roles now linking to a subtype.
Steps To Reproduce
Create facttype between two objecttypes. Add a subtype to an OT with Create Subtype. Observe the changed role in the facttype but no indication in graphics that the role has changed to a subtype.
Additional Information
Create subtype on an OT should not have side-effects on other fact- or objecttypes, especially if these changes are not indicated.
If you want to change the roles of related FTs, this should be asked for during the creation of a subtype or it should be a secondary action (Create subtype and relate roles vs. Create subtype).
It took me quite a bit of time to figure out why removing new subtypes caused the deletion of existing fact types...
Also, if I want to correct the role back to the original supertype, that's REALLY difficult. Basically I have to remove the subtype, killing the fact type as well, then create the subtypes, then add the fact type again.
