fix #53936: incomplete MusicXML text for 7sus4 #1923
Merged
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Previously, for 7sus4, we exported kind of suspended-fourth, text of "sus4", and the 7 was a degree tag with no specific text. We import this just fine, but other applications apparently would interpret this as "sus4add9". So on advice of Michael Good, we now export the kind text as "7sus4", and explicitly set the degree text for the 7 to "". Similarly for 9sus4 etc.
This PR also fixes a chord parsing issue where we would try to parse b913 as b 913, rather than b9 13, potentially leading to a crash.