Cannot paste a region into a state

[RainerKlute]

To reproduce this bug, do the following:

1. In a composite/orthogonal state, select a region you want to copy.
2. Press [Ctrl+C].
3. Select a state you want to paste the copied region to.
4. Press [Ctrl+V].
5. Nothing happens.

I would expect the copied region to be inserted into the state as another region in addition to the already exiting one(s). Likewise, it is not possible to paste the copied region into a simple state, turning it into a composite state.

It is possible, however, to paste the copied region onto the statechart as a top-level region.