Regression: Ambitus causes a crash just while clicking on it

• Jul 11, 2018 - 14:34
Reported version
S5 - Suggestion

After dragging an ambitus (which shows note range, and click on it, MuseScore 2.3.1 (OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (32-bit): 2.3.1, revision: 0899e9d) immediately crashes. (Although it is a seldom-used "early music feature", it cause crashes so the priority was set to critical.)

In MuseScore 2.1, 2.2 or 3.0 development build (OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (32-bit): 3.0.0, revision: 206532b), crash does not exist.

I know programming, but haven't writing program for MuseScore (GitHub) yet. Also sorry for bad English.


Title Ambitus causes a CRASH just while clicking on it Ambitus causes a crash just while clicking on it
Status (old) active won't fix
Status active won't fix

I can confirm the crash in 2.3.1 (and its lack in 2.2.1). But 2.3.1 is the last of the 2.x series. As the problem doesn't exist in master this issue needs to get closed unfixed, unfortunatly

Out of sheer curiosity I tried to debug this in my still existing 2.3.1 build env: Seems to be a Heisenbug, doesn't happen in Debug! Seems to happen only when built in REELASE mode?

I can confirm the bug on Windows using the trial release (?) of 2.3.2, but also the fact that I cannot reproduce it under debugger. My assumption is the problem has to do with the Inspector, since I don't get a crash if I turn it off, but I don't actually see a recent change there. Odd, as I see a whole bunch of fields in the Inspector for ambitus that I do not not remember being there. But the only relevant changes I do see for ambitus is the removal of the accessibility functions and a correction for the octave:…


My money is on the first. I don't quite understand what's going on there. I'm guessing the accessibility functions were removed so we could take advantage of inheritance and use generic Element. Not sure why that would cause a crash though.

As said here:, the issue occurs in May (11/12 May)

  • This nightly works: 7345a8c

  • This one crashes when clicking on the ambitus symbol: 6257956

There is three commits between them:

The last mentioned nithlty and the previous commit (…) as intended for noteheads in drumset for percusion instrument.

The next commit after the first mentioned nightly, which works, would be not related ?…

And it remains the commit between them:…