Add to last closed file list.

def add_last_closed_file(self, fname):
        """Add to last closed file list."""
        if fname in self.last_closed_files:
            self.last_closed_files.remove(fname)
        self.last_closed_files.insert(0, fname)
        if len(self.last_closed_files) > 10:
            self.last_closed_files.pop(-1)