0.9.5 latest. Clef crash.

If you insert two mid-measure clef changes (for example keeping a scalar run within the staff), and you try to change/undo the clef by dragging the original clef from the pallet over the first clef change. Mscore crashes and closes. Does not freeze, just shuts down.

For example, if | = bar line, B = bass clef and T = treble
| B T B |
If I drag a B clef from the pallet over the T clef, mscore crashes.