fix #178176: Hang/crash by extending a glissando on a note with anoth…

…er one in the second staff
musescore · Feb 28, 2017 · 8ff878f · 8ff878f
1 parent 696d420
commit 8ff878f
Showing 1 changed file with 9 additions and 6 deletions.
diff --git a/libmscore/line.cpp b/libmscore/line.cpp
@@ -408,12 +408,15 @@ void LineSegment::editDrag(const EditData& ed)
                         qDebug("LineSegment: move end anchor");
                         Note* noteOld = static_cast<Note*>(l->endElement());
                         Note* noteNew = static_cast<Note*>(e);
-
-                        noteOld->removeSpannerBack(l);
-                        noteNew->addSpannerBack(l);
-                        l->setEndElement(noteNew);
-
-                        _userOff2 += noteOld->canvasPos() - noteNew->canvasPos();
+                        Note* sNote = static_cast<Note*>(l->startElement());
+                        // do not change anchor if new note is before start note
+                        if (sNote && sNote->chord() && noteNew->chord() && sNote->chord()->tick() < noteNew->chord()->tick()) {
+                              noteOld->removeSpannerBack(l);
+                              noteNew->addSpannerBack(l);
+                              l->setEndElement(noteNew);
+
+                              _userOff2 += noteOld->canvasPos() - noteNew->canvasPos();
+                              }
                         }
                   else if (ed.curGrip == Grip::START && e != l->startElement()) {
                         qDebug("LineSegment: move start anchor (not impl.)");