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Crash when opening/closing mixer quickly on big score, e.g. Symphony Orchestra template (Master, Windows) #23505

@metasekk

Description

@metasekk

Issue type

Crash or freeze

Bug description

See the title

Steps to reproduce

2024-07-08.11-07-41.mp4

Screenshots/Screen recordings

No response

MuseScore Version

Tested on latest 4.4 master (cff770b)

Regression

Yes, this used to work in MuseScore 4.3.2

Operating system

Win10 (22H2); RAM: 16Go; CPU: Intel Core i5-9300H

Additional context

Found when re-testing #23158 after #23495 (comment).
I couldn't reproduce it in 4.3 (watch the video above).

I hope it isn't a duplicate (I searched in the currently opened issues, but couldn't find one corresponding). Close to #9467 but without requiring playback. EDIT: I just discovered it was equivalent to #13903 which was closed last month.

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P1Priority: HighcrashIssues involving a crash of MuseScoreregression MS4Regression on a prior release

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