fix z-factor regression when ereasing switches by dragging the mouse

qtgui/songeditor.py

@@ -35,7 +35,7 @@ _zValuesRelativeToScene = { #Only use for objects added directly to the scene, n
     "barline":5,
     "group" : 6,
     "switch":7,
-    "barlineGroupHighlight":8,
+    "barlineGroupHighlight":9,
     "playhead":90,
 }
 
@@ -258,7 +258,7 @@ class TrackStructure(QtWidgets.QGraphicsRectItem):
         #self._markerLine.setParentItem(self) #incompatible with zValues. We need this relative to the scene
         self.parentScene.addItem(self._markerLine)
         #self._markerLine.setY(self.pos().y()) #won't work yet. We are not in the scene ourselves. We set it in mousePressEvent, before show()
-        self._markerLine.setZValue(_zValuesRelativeToScene["switch"])
+        self._markerLine.setZValue(_zValuesRelativeToScene["switch"]+1) #It is not possible to have this in front of barlines AND the switches. Barlines need to be below switches for multiplied-patterns. But we want to "erase" the switches
         self._markerLine.hide()
 
         #Semitransparent hover-switch to show which one would be activated/deactivated