Lyrics: Hyphens get lost when navigating with arrow keys

Issue type

File corruption

Description with steps to reproduce

This could be a "File corruption", since it silently destroys data when executing a supposedly read-only action. Or it could be a "UX/Interaction bug", because navigation with arrow keys feels like it should be read-only, but actually destroys hyphens.

Steps to reproduce:

1. Write a melody of some sort
2. Enter lyrics (click first note, press Ctrl+L, start typing), use hyphenation where a syllable spans more than one note and ends in another hyphen (e.g. "HE----LLO")
3. (Optional) Do something else, then edit last syllable again
4. Press "Arrow Left" on the keyboard repeatedly to navigate towards left

Expected behavior: Navigating towards left is a purely read-only action, and does not modify anything, especially not the lyrics.

Actual behavior: The hyphens immediately after multi-note-syllables are deleted.

Supporting files, videos and screenshots

Demo:

https://github.com/user-attachments/assets/6b305d46-4e28-4fbf-9e3f-bcfb7182c9ea

In case you want to play around with this exact file, here it is:

Supercalifragilisticexpialidocious.mcsz.renamed-to.zip

I don't think this little snippet reaches the threshold of originality, and is therefore in public domain. If I'm wrong about that, I hereby release it into public domain.

Or in other words: Have fun :)

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

Arch.: x86_64, MuseScore Studio version (64-bit): 4.4.4-243461245, revision: github-musescore-musescore-2232670

Regression

No.

Operating system

Debian GNU/Linux trixie/sid

Additional context

This is distinct from older (fixed) bugs in the same area: #15406, #15407

The accidental loss of lyrics-hyphenation cannot be undone by pressing "Undo", so in some sense this is an instance of #19796, although I'd argue this loss of lyrics-hyphenation shouldn't happen in the first place, and therefore is a separate bug.

This is distinct from #24621, because this is not about differences between versions, but rather a UI action causing data loss.

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

Open Supercalifragilisticexpialidocious.mcsz.renamed-to.zip and reproduce the lyric-editing sequence, including repeated Arrow Left navigation after entering HE----LLO. Trace the lyrics editing and keyboard-navigation entry points to determine where the hyphens are removed. Done means navigating left leaves lyrics unchanged and the behavior is covered by a regression check.