2005-07-30  Sven Neumann  <sven@gimp.org>

	* app/display/gimpdisplayshell-render.c
	* app/display/gimpdisplayshell.[ch]: added
	gimp_display_shell_set_overlay(); allows to overlay a mask over the
	display to visualize a selection.

	* app/tools/gimpforegroundselecttool.[ch]: use the new functionality
	to display the selection. Escape cancels the tool, Enter applies the
	selection.