Apply time signature after undo can produce inconsistent results

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

1. Create a new score with default 4/4 time signature and fill 3 measures with 1/4 notes
2. Select just the first two measures
3. Apply a 3/4 time signature from the palette
4. Note the following (4/4) measure remains as is, with an extra rest inserted in the previous (new) 3/4 measure
5. Undo - returns to state after step 2. (first two measures selected)
6. Re-execute step 3 (apply 3/4 time signature)
7. Expected: should produce same result as seen in step 4
8. Actual: result is different, with the notes from all 3 measures now spread over 4 3/4 measures followed by an empty 4/4 measure.

Supporting files, videos and screenshots

Start:

After first 3/4 apply:

After undo and reapply 3/4:

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

4.4

Regression

Same in all versions of 4
Regression of MuseScore 3

Operating system

Windows 11

Additional context

Not a major issue, just a weird quirk that may be worth investigating, as anything that means "undo" isn't properly restoring a previous state can potentially lead to more serious problems.

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