Add a function gdk_window_get_internal_paint_info(), so that using X

Add a function gdk_window_get_internal_paint_info(), so that using X

Fri Jul 13 15:33:32 2001  Owen Taylor  <otaylor@redhat.com>

	* gdk/gdkwindow.[ch]: Add a function gdk_window_get_internal_paint_info(),
	so that using X functions on a GdkWindow is possible, if
	a little hairy.

	* gdk/gdkgc.c (gdk_gc_offset): Add a function to offset the clip
	and ts_origin of a GC, so that external parties can offset/restore
	a GC, when using gdk_window_get_internal_paint_info().