add read-only "scroll_offset" property for notification when the layout

add read-only "scroll_offset" property for notification when the layout

2001-06-08  Havoc Pennington  <hp@redhat.com>

	* gtk/gtkentry.c (gtk_entry_class_init): add read-only
	"scroll_offset" property for notification when the layout offsets
	may have changed
	(gtk_entry_adjust_scroll): add notify for scroll_offset
	(gtk_entry_layout_index_to_text_index): function to compensate for
	preedit string when doing coordinate stuff on the entry's layout
	(gtk_entry_text_index_to_layout_index): inverse function
	(gtk_entry_get_layout_offsets): hook to get current position of
	the layout
	(gtk_entry_get_layout): hook to get the layout itself.

	* gtk/gtklabel.c (gtk_label_get_layout): new function