Items should retain anchor positions when note values change

[oktophonie]

Issue type

UX/Interaction bug (incorrect behaviour)

Bug description

If this is changed to a single semibreve:

It should become:

(Currently the hairpin disappears, presumably deleted with its starting note.)

Or if the first note here is changed to a minim:

We should get:

Which does already sort of work: it looks like this at first:

but when trying to adjust the start hairpin of the handle it snaps to the right position.

This same behaviour should apply to other spanners too, and indeed to non-spanner items, as long as they can are not generally required to be directly attached to a notehead.

MuseScore Version

master (OS: Artix Linux, Arch.: x86_64, MuseScore Studio version (64-bit): 4.4.0-241310305, revision: github-musescore-musescore-010bce7)

Regression

No.

Operating system

Any

See also the similar-ish and possibly related #19853 and #21921 and #22769