fix exception on delete row
@@ -448,7 +448,7 @@ class Mutator(app.selectable.Selectable):
self.upperChangedRow = self.penRow
elif change[0] == 'dr': # Undo delete range.
self.insertLinesAt(change[1][0], change[1][1], change[2],
- kSelectionCharacter)
+ app.selectable.kSelectionCharacter)
elif change[0] == 'ds': # Undo delete selection.
self.insertLines(change[1])
elif change[0] == 'i':
