fix crash in MusicXML with tie
hide additional media behind experimental flag
fix multiple bugs in fret diagram handling
hide fret diagram frame behind experimental flag
fix crash when pressing Join Score and no album
fix tremolo bounding box in palette
fix #11118: Join Scores causes crash
read only spinboxes in debugger dialog
fix #19612
Merge pull request #202 from lvinken/musicxml-fixes

fix #19612