Undo fails to reset tablature staff's custom string assignments

Issue type

UX/Interaction bug (incorrect behaviour)

Bug description

In a score with a linked Guitar + Tablature system, after a pitch change in the treble clef, and then after Undo, the treble clef correctly returns to its original pitch but MuseScore fails to restore the tablature custom string assignments.

This incomplete Undo is a real problem when the following sequence of events occurs:

    • multiple string assignments exist
    • I have a group of notes selected (for instance, an entire measure or more)
    • I accidentally drag pitch-drag the selection. The is particularly problematic as I find that MuseScore frequently scrolls the screen when I click a note, resulting in a pitch drag. (Maybe I need to turn off MagicMouse scrolling?)

After this kind of incomplete Undo the only resort is to manually reset all the non-default string assignments ... or to open a Save/Backup to see if the measure is extant therein.

Steps to reproduce

1. New>Template>Guitar + Tablature (This creates a linked staff system)
2. Add a note G note (the open G string, the 3rd string)
3. In the tab staff drag the note to the D string, the 4th string (result is the fret number 5)
4. Press Undo

see comment

Result:

1. The treble clef reverts correctly
2. The tablature fails to revert to its custom D string assignment. Instead it displays the default open G string.

MuseScore Version

4.2.1

Regression

Yes, this is a regression. Tablature string assignments are properly reset in MuseScore 3.6.2 after Undoing a treble staff pitch change.

Operating system

MacOS 13.5.2