wrong comparison. is -> ==

qtgui/items.py

@@ -865,26 +865,26 @@ class GuiGenericText(GuiItem):
 
 def staticItem2Item(staticItem):
     typ = staticItem["type"]
-    if typ is "Chord":
+    if typ == "Chord":
         return GuiChord(staticItem)
-    elif typ is "Rest":
+    elif typ == "Rest":
         return GuiRest(staticItem)
-    elif typ is "LegatoSlur":
+    elif typ == "LegatoSlur":
         return GuiLegatoSlur(staticItem)
-    elif typ is "MultiMeasureRest":
+    elif typ == "MultiMeasureRest":
         return GuiMultiMeasureRest(staticItem)
-    elif typ is "DynamicSignature":
+    elif typ == "DynamicSignature":
         return GuiDynamicSignature(staticItem)
-    elif typ is "Clef":
+    elif typ == "Clef":
         return GuiClef(staticItem)
-    elif typ is "KeySignature":
+    elif typ == "KeySignature":
         return GuiKeySignature(staticItem)
-    #elif typ is "TimeSignature":
+    #elif typ == "TimeSignature":
     #    return GuiTimeSignature(staticItem)
 
-    elif typ is "MetricalInstruction":
+    elif typ == "MetricalInstruction":
         return GuiMetricalInstruction(staticItem)
-    elif typ is "BlockEndMarker":
+    elif typ == "BlockEndMarker":
         return GuiBlockEndMarker(staticItem)
     elif typ in ("InstrumentChange", "ChannelChange", "LilypondText"):
         return GuiGenericText(staticItem)