Crash when stopping MIDI recording while sustain pedal is pressed

[RichardScharf]

Bug Summary

LMMS crashes after stopping a piano roll MIDI recording while sustain pedal is pressed.

Steps to reproduce

1. Connect and configure a MIDI keyboard with a sustain pedal
2. Open the piano roll editor
3. Start a new MIDI recording
4. Press any note on your keyboard while holding the sustain pedal
5. Press the stop recording button while the sustain pedal is still pressed

Expected behavior

LMMS stops the recording and releases all keys that are still pressed.

Actual behavior

LMMS crashes instantly. After reopening the project and pressing recover the recording is lost completely!

Affected LMMS versions

Version 1.2.2 (Linux/x86_64, Qt 5.15.3, GCC 11.2.0) installed using Flatpak