Cross-staff chords: Chord should be able to span over two staves in a grand staff

[Polyhedron-ZXero]

Task description In piano scores, sometimes there are needs for a chord to span over both upper and lower staff:

Currently in MuseScore 4, the above is not possible. It can only move the entire chord to upper or lower staff.

I'm aware of a workaround described at https://musescore.org/en/node/8717, but it's not an ideal way to do that and it creates unnecessary complexity to the score, especially if the notes are complicated as the above example.

[Jojo-Schmitz]

11 years old request, see https://musescore.org/en/node/14687