Crash when repeatedly pressing Shift+A
This bug report came in via email.
Steps to reproduce in 2.0.2:
* Start with a blank score, e.g. just choose Treble clef template.
* Type letter a; an a crochet/quarter note appears.
* Type Shift+A: the A above appears.
* Repeat pressing Shift+A: further octaves of A's appear, but the maximum of note G9 (MIDI note 127) is not respected.
If you continue for too long, MuseScore will crash.
Fix would be to limit to the corrected note range, G9 (MIDI note 127) and disallow adding further notes beyond this range.