fix #29776: Solo is not activated on file load
fix #28316
	modified:   mscore/instrwidget.cpp
	modified:   mscore/instrwidget.ui
Add accessibility for instrwidget.ui
	modified:   mscore/instrwidget.ui
Fix #28316 (better)
	modified:   mscore/instrwidget.cpp
	modified:   mscore/instrwidget.ui
Merge branch 'fix_28316' of github.com:andreituicu/MuseScore
fix hairpin & trill length
fix & update tests
fix extend of line on last measure
Merge pull request #1143 from Igevorse/29776

fix #29776: Solo is not activated on file load
Merge remote-tracking branch 'upstream/master'
Qt 5.2 is now required
fix #30281
Fix #22604 - Documentation updates and added slide support to GP3
Merge pull request #1190 from jpirie/guitar-pro-import

Slide constants and added slide support to GP3
fix #30186: Hang when selecting all and double-clicking feature in Beam Properties
fix editing of linked fret board diagrams
Fix #21652 - Support for spcific lyric tracks in GP4 and GP5 file formats
fix #30041
set track2 when creating ottava and hairpin
fix endSpanner output, only one endspanner by spanner, output endspanner for spanner ending at end of score