Inconsitency in parent of root state between core and gui

[franzlst]

The parent of a root state model is None, whereas the parent of a root state (in the core) is the state machine.

I think this is an inconsistency which should be removed. I vote for setting the parent of a root state always to the state machine.

This will lead to further changes, as e.g. the model_changed method relies on the root state's parent being None.

Originally created by @franzlst ([email protected]) at 2019-07-19 13:45:37+00:00 (moved from RMC internal repository)