Improve MusicXML export of section breaks
Section breaks get exported to MusicXML as system breaks, as far as I know because in MusicXML there's no such thing as a section break. So far, so bad, but the situation could get improved by:
a) adding an explicit time signature (if there isn't an explicit one before already), same as whatever was in effect before that section break and disable courtesy time signature
b) adding an explicit key signature (if there isn't an explicit one before already), same as whatever was in effect before that section break and disable courtesy key signature
c) adding an explicit clef (if there isn't an explicit one before already), same as whatever was in effect before that section break and disable courtesy clef
d) restart measure numbers to start counting from one
e) have the system to start with a long instrument names
Bonus points for detecting those changes above on import to mean to add a section break rather than a system break
Comments
It's impossible to set instrument names to long, unless we force a part-name-display in every part at the beginning of a new section. Usually a new section break resets measure if the engraver sets it in Musescore. Sometimes a score with multiple movements may count using continuous measures, such as the new Boosey edition of Copland's Third Symphony (using Sibelius).