Getting maximum possible window size

[Philip Withnall <philip tecnocode co uk>]

Hi,

I need to find the maximum possible size of a window (i.e. when it's
maximised). So far I've come up with gdk_screen_get_width() and
gdk_screen_get_height(), but I presume they don't take the panels into
account (and thus return sizes which are too big). What else is there?

Thanks,
Philip Withnall