Allow to pop up menus without grabbing the keyboard. Useful for stuff like

Allow to pop up menus without grabbing the keyboard. Useful for stuff like

2005-03-31  Michael Natterer  <mitch@gimp.org>

	Allow to pop up menus without grabbing the keyboard. Useful for
	stuff like virtual keyboards. Fixes bug #159890

	* gtk/gtk.symbols
	* gtk/gtkmenushell.[ch]: added boolean property "take-focus"
	and public API gtk_menu_shell_set/get_take_focus().

	* gtk/gtkmenu.c (gtk_menu_popup)
	(popup_grab_on_window): don't grab the keyboard if take_focus
	is FALSE.

	* gtk/gtkmenuitem.c (_gtk_menu_item_popup_submen): propagate the
	parent menu_shell's take_focus property to the submenu which is
	about to be popped up.