Fix pasting ties

as taken from musescore#8848, which has some git issues, and backport of musescore#8818, part 2

Author: wizofaus

libmscore/note.cpp

@@ -1699,7 +1699,7 @@ bool Note::acceptDrop(EditData& data) const
          || (type == ElementType::FRET_DIAGRAM)
          || (type == ElementType::FIGURED_BASS)
          || (type == ElementType::LYRICS)
-         || e->isSpanner());
+         || (type != ElementType::TIE && e->isSpanner()));
       }
 
 //---------------------------------------------------------

libmscore/tie.cpp

@@ -77,12 +77,12 @@ bool TieSegment::edit(EditData& ed)
       {
       SlurTie* sl = tie();
 
-      if (ed.key == Qt::Key_X) {
+      if (ed.key == Qt::Key_X && !ed.modifiers) {
             sl->setSlurDirection(sl->up() ? Direction::DOWN : Direction::UP);
             sl->layout();
             return true;
             }
-      if (ed.key == Qt::Key_Home) {
+      if (ed.key == Qt::Key_Home && !ed.modifiers) {
             ups(ed.curGrip).off = QPointF();
             sl->layout();
             return true;