Fix crash on undo selected clip insert

src/timeline2/model/timelinemodel.cpp

@@ -841,7 +841,7 @@ bool TimelineModel::requestClipMove(int clipId, int trackId, int position, bool
         } else {
         }
     }
-    ok = ok && getTrackById(trackId)->requestClipInsertion(clipId, position, updateView, finalMove, local_undo, local_redo, groupMove, false, allowedClipMixes);
+    ok = ok && getTrackById(trackId)->requestClipInsertion(clipId, position, updateView, finalMove, local_undo, local_redo, groupMove, old_trackId == -1, allowedClipMixes);
 
     if (!ok) {
         qWarning() << "clip insertion failed";