Crash when adding/removing brackets to/from notehead (tested in tab mode)

1. Select one or more notes
2. Add brackets from the noteheads pallet
3. Remove the brackets with undo (Ctrl+Z or from the edit menu)
4. Click on the properties tab for the selected notes
5. Click the button to add brackets (no brackets will be added but the program doesn't crash yet)
6. Click the adjacent button for removing brackets
7. Click the add brackets button again to produce a crash

Workaround:
Either add brackets from the noteheads pallet, or from the properties tab. Do not use both.