Fix saving/importing Musicxml (.xml) format
MusicXml saving and opening doesn't work.
I get the error: "file is corrupted"
Bar 13, stave 1, voice 2 too long. Expected: 4/4; Found: 9/8
Bar 25, stave 1, voice 2 too long. Expected: 4/4; Found: 9/8
To reproduce, open the .mscx file, save it as .mxl in Musescore 18.104.22.16815, then try to open the mxl file in Musescore
Sibelius 8.2.0 can open the file, after telling me it uses an obsolete from of musicmxl, but the score looks weird - hidden objects are visible, pedal lines are altered, and there are sonic gaps between some bars