Autoplacement won't allow a stem crossing staves

To me, it's not a bug that space is added automatically when autoplace is enabled, but it is a bug that disabling autoplace for the stem doesn't override this.

I've seen examples of this. Extending the stem to make it look like the chord is in both the right and left hands of the piano staff will not conned the notes. I've noticed that it will eventually work, but by then the staves have move as part of automatic placement.

It's important because it prevents a common technique used in cross-staff notation from working ("faking" a cross-staff chord as shown in the linked article).

Came up again in https://musescore.org/en/node/281259.

There is now a workaround explained in https://musescore.org/en/node/281259.

See https://github.com/musescore/MuseScore/pull/4564

This PR excludes the stem (and other elements) from the chord shape if autoplace is disabled, thus allowing it to extend into other staves, to cross hairpins, and do other useful things. So, it gives a second workaround, in addition to the fixed staff spacer method described in the post linked above.

Fixed in branch master, commit bbbe1f68e8

fix #280677, fix #279643: semantics of disable autoplace on stems et al

Fixed in branch master, commit 5fe8363cd7

Merge pull request #4564 from MarcSabatella/280677-autoplace-stem

fix #280677, fix #279643: semantics of disable autoplace on stems et al

Fixed in branch 3.0.1, commit 5a4dd5514e

Merge pull request #4564 from MarcSabatella/280677-autoplace-stem

fix #280677, fix #279643: semantics of disable autoplace on stems et al

Automatically closed -- issue fixed for 2 weeks with no activity.