Just whenever we need it, please.
This removes a warning from the start-up sequence, but the warning is still there when you open the dialogue. It's complaining that a model has size -13 and another has size -14, but I don't know which model that is. The UserChangesModel seems to be fine at a size of 1 or so.
Contributes to issue CURA-7501.
As discussed in the CCB this morning. Since the new profile will be the _changed to_ profile rather than the _changed from_ (the latter of which would make the button useful, but since the profile is already switched at that point it would be a lot of work), the 'Create New Profile ...' button (in the Keep/Discard dialog) is redundant, since you can always create a new profile if you select keep changes.
