def back(self) -> bool:
        """Go back in the history.

        Returns:
            `True` if the location changed, `False` if not.
        """
        if self._current:
            self._current -= 1
            return True
        return False
Go back in the history.

        Returns:
            `True` if the location changed, `False` if not.
        
frogmouth/widgets/viewer.py