<AWT Dev> Why does JFrame.setSize conflict with JFrame.setExtendedState?

[Clemens Eisserer]

Hello,

I have some code which first sets the size of a JFrame, was well as it
maximizes it:
setSize(new Dimension(800, 600));
setVisible(true);
setExtendedState(JFrame.MAXIMIZED_BOTH);

I wonder wether this combination is "legal", because I always get
different results with XAWT and also MAWT. No matter how I order the
setSize/setExtendedState it seems to completly random.
Sometimes I get a 800x600 window, somtimes its macimized and very
seldom I get a window which is ~50px high and maximized horizontal.

Shouldn't it simply open a 800x600 window and resize that to
fullscreen once it has been realized on the native side? Whats going
on here?
My window-manager is KDE-3.5.8.

Thanks, Clemens