This one is more of a feature request than a bug.

The preProcessKeyEvent() and postProcessKeyEvent() methods should be methods
that subclasses of Container can override. Currently if a container wants all
its children's keypresses (and this is a very common occurance) it must
register as KeyListeners on them all. A very time consuming action,
especially since the methods are already existing to handle this correctly
but just with the wrong visibility.