Remove restriction on a barline's negative "Span From" value
This is a suggestion to avoid collisions between cresc./dim. lines and barlines which span between staves. The suggestion means removing the current limit of -4 on the "Span From" property, which prevents the user from extending a barline upwards far enough. This occurs where a part uses several ledger lines above the stave: see Flute 2 in the example score.
For stave text we can use a Frame to provide a white border in cases like this, but the cresc./dim. lines do not offer a Frame property in the Inspector. So it's really frustrating that this arbitrary limit of -4 on the "Span From" value of a barline means we have to put up with a large white space.
The attached score made with MuseScore 3.1 illustrates the problem.
And this is the sort of assymetrical spanning which is required: