Add support for OS X like sliding of toolbar items during drag and drop,

Add support for OS X like sliding of toolbar items during drag and drop,

Mon Oct 20 20:27:22 2003  Soeren Sandmann  <sandmann@daimi.au.dk>

	Add support for OS X like sliding of toolbar items during drag and
	drop, (#110919, Dave Bordoley)

	Make dnd highlighting the responsibility of the
	application. (Fixes #116298, Owen Taylor)

	* gtk/gtktoolbar.h: Add prototypes for new API.

	* gtk/gtktoolbar.c
	(physical_to_logical, logical_to_physical): new functions
	converting between "position including placeholders" and "position
	excluding placeholders".
	(gtk_toolbar_class_init): remove drag_leave and drag_motion
	handlers
	(struct _ToolbarContent): new struct containing information
	related to toolbar items.
	(gtk_toolbar_highlight_drop_location): new public function
	(gtk_toolbar_unhighlight_drop_location): new public function

	* tests/testtoolbar.c
	(toolbar_drag_motion, toolbar_drag_leave): new functions
	(main): connect to dnd signals.  Make the "New" item expand to
	make drag and drop more exciting.