Folks,
please consider this example.
```
{
\override Score.RehearsalMark.staff = #1
f'1 \mark #15
f'1 \mark \default
f'1 \mark \default
f'1
}
{
\override TextScript.staff-padding = #1
f'1
f'1^"P"
f'1^"Q"
f'1^"R"
}
```
As can be seen, `staff-padding` works fine for `TextScript` grobs,
however, it is ignored for `RehearsalMark`: the letters are not
aligned on the base line. AFAICS, however, it should work, since
`RehearsalMark` has the `side-position-interface` that defines the
`staff-padding` property.
Am I doing something wrong or is this a bug?
Werner
