[1.0] Shift + drag tuplet, delete, undo cause crash

MuseScore 1.0 (apparently in trunk the tuplet is not deleted, only the notes are changed to rests)

1. Create a score with a tuplet of 3 eight notes
2. Lasso select it with shift + mouse drag
3. press del
4. Undo

Result : Crash
Expected result : the tuplet is replaced by a quarter rest (?)