[MU4 Issue] Grace notes overlap with trill line

[oscardssmith]

Adding a trill with a grace note at the end will by default place the trill such that it collides with the grace note

Ideally, it would move the trill up a few pixels.

[cbjeukendrup]

This seems related to #15249.

[oktophonie]

Really the trill line should end before the grace notes. But grace notes need a lot of attention in general. At the moment we can't attach items to them as though they were independent notes, as they occupy the same tick as their main note.

[Jojo-Schmitz]

Just for the record: Seems not to be an issue with Mu3, so is/was a regression