fix #36186 : crash when pasting with left-over portion spanning over an invalid duration
fix #39621: accessible info for drum and slash notation
Merge pull request #1465 from MarcSabatella/39621-accessible-nonpitched

fix #39621: accessible info for drum and slash notation
select first score on default in startcenter scorebrowser
Merge pull request #1462 from AntonioBL/second_voice_split

fix #36186 : crash when pasting with left-over portion spanning over an ...
add test for fix #36186
fix #20783: add section breaks to joined scores

and line and page breaks too...