fix #21452
add framework to sync audio and midi
change frets count of electric guitar to 24
fix shortcuts Ctrl+O for open, Alt+shift+B to append measures
try to get DPI with new QScreen API
fix #23005
fix #22977
fix #23067: Notehead changed to Brevis in 1.3 score appears as cross
add regression test for noteheads
fix #23085
add more debug info for DPI detection
various fix for slurs, slurs no more possible between linked staves and staves in different parts
fix #23083: Pasting tie or slur causes crash
fix #23126: Slur of pasted notes ends on note it was copied from
fix reordering of instruments corrupts spanner
fix #23125: Slurs of existing instrument disappear after removing top instrument
fix #21721: Spanners not properly deleted when corresponding anchoring notes are deleted
fix spanner ticks when removing measures and undo
fix #23131: crash on deletion of selection that includes last measure of score
fix #23129: chordnames not propagated to parts if parts generated after score load