[MU4 Issue] Holding down the mixer button causes Musescore to crash

[erinic04]

Describe the bug
Holding the mixer button for about a second on larger scores causes Musescore to crash

To Reproduce
Steps to reproduce the behavior:

1. Open a larger score
2. Hold the mixer button (F10 by default)
3. Observe the crash

Expected behavior
Musescore shouldn't crash

Screenshots
If applicable, add screenshots to help explain your problem.

Platform information

• OS: [e.g. macOS, Windows, Linux]

Additional context
Add any other context about the problem here.

[Tantacrul]

What OS are you using? I can't replicate it with the shortcut or the UI.

[erinic04]

I'm using Windows. Also, it needs to be a larger score for it to work. I did it reproducibly on a 7 minute marching band full score (with Muse Sounds if that makes a difference)

[cbjeukendrup]

@erinic04 It seems that I can only reproduce this issue during playback. Is that the case for you too?

[erinic04]

It wasn't the case before, not sure if it is now

[cbjeukendrup]

@erinic04 Could you please try if this problem is fixed for you in the builds from #14790? (see https://github.com/musescore/MuseScore/wiki/Downloading-and-running-test-builds#downloading-builds-from-pull-requests for how to download it)

[erinic04]

Yeah it's fixed for me (whether holding the button while the score is playing or not)

[erinic04]

I tested it on a full orchestra score that's 600 measures long so we good

[zacjansheski]

@cbjeukendrup should this still have the label "needs info"?

I have reproduced in the nightly, but it takes quite a bit and I found it it easier to reproduce when the mixer is docked.

https://github.com/musescore/MuseScore/assets/69917893/fccf8d26-468b-4aa0-95e3-be591f60a136
13903_ZJ.zip

Mvt 4_Beethoven__Symphony_No._9__Op._125.zip

[cbjeukendrup]

I think we have enough info indeed :)

I checked it again, and found indeed that the same crash still happens and the same fix still works.