Incorrect duration ratio for a duplet taking up odd number of beats (e.g. 5 or 7)

Issue type

Engraving bug (incorrect score rendering)

Description with steps to reproduce

The duration multiplier for duplet notes is incorrect. Basically, it yields 2:x total duplet duration is x/y (as irreducible fraction). Because of this, duplets taking up full measure in 5/8 time, will consist of two quavers (8ths), having ratio of 2:5, which is bizzare. I would expect to see two crochets (4ths) and 4:5. Generally, the ratio should be between 1/2 and 1.

A real-world example of music like this would be movt. 4 of Ravel's String Quartet. I believe all score editions you'll find would show crochets in duplets that take up 5/8 measure.

Supporting files, videos and screenshots

IMSLP01617-Ravel_-String_Quartet(Score).pdf

What is the latest version of MuseScore Studio where this issue is present?

4.5.2

Regression

No.

Operating system

macOS 15, I believe it occurs on all platforms

Additional context

I guess this is the code responsible for tuplet creation:
https://github.com/musescore/MuseScore/blob/42be6134ece0731eb46865ac73edd90e3fca0e91/src/notation/internal/notationnoteinput.cpp#L686

Perhaps it shouldn't try to compute just denominator, but the ratio itself. I'm happy to make a patch myself, looks straightforward, but I'm not 100% sure that I'm not missing anything.

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

Start at src/notation/internal/notationnoteinput.cpp around line 686, the code path identified for tuplet creation. Reproduce a duplet filling an odd-beat measure such as 5/8 and compare its displayed note durations and ratio with the expected 4:5-style result. Done means the duration ratio is correct for odd-beat cases without regressing other tuplets.