Maximizing window does not trigger change listener

When the window of the attached prrogrom is resized the graphics is adjusted
to always fill the whole drawing area. This is triggered
by a change listener on the graphicsPane. This seems to
work nicely when I adjust the window size manually with the
mouse. But if I hit the maximize button in the upper right
corner of the window this does not seem to trigger the
change listener, which I do not understand. (This works
if I attach the listener to the drawingPane instead.)
Even worse, when I hit the button again to go back to
the original size, the application dies with a StackOverflowError.
See attached file 'rsize_exception.txt'.