def undo(self):
if len(self.startpos) == 1: return
# calling the undo
res = Doudou.undo()
if isinstance(res, str):
print res
error_dialog(self.get_toplevel(), res)
return
# poping the last starting position
oldendpos = self.startpos.pop()
# removing the tag
newendpos = self.startpos[len(self.startpos) - 1]
oldenditer = self.buffer.get_iter_at_offset(oldendpos)
newenditer = self.buffer.get_iter_at_offset(newendpos)
self.buffer.remove_tag(self.not_editable_tag, newenditer, oldenditer)
# and we set the cursor
self.buffer.place_cursor(newenditer)
#print self.startpos
return True
