Offer to recover files from autosave.

def try_recover_from_autosave(self):
        """Offer to recover files from autosave."""
        autosave_dir = get_conf_path('autosave')
        autosave_mapping = CONF.get('editor', 'autosave_mapping', {})
        dialog = RecoveryDialog(autosave_dir, autosave_mapping,
                                parent=self.editor)
        dialog.exec_if_nonempty()
        self.recover_files_to_open = dialog.files_to_open[:]