only call grab_add if pointer_grab succeeds. (gtk_list_unmap): remove

only call grab_add if pointer_grab succeeds. (gtk_list_unmap): remove

Tue Jan 19 22:15:10 1999  Lars Hamann  <lars@gtk.org>

	* gtk/gtklist.c
	(gtk_list_button_press):  only call grab_add if pointer_grab succeeds.
	(gtk_list_unmap): remove pointer/widget grabs if needed.
	(gtk_list_signal_focus_lost): removed.
	(gtk_list_focus) (gtk_list_set_focus_child): set last_focus_child.
	(gtk_list_remove_items_internal) (gtk_list_clear_items): unset
 	undo_focus_child if necessary. In case of SELECTION_BROWSE/EXTENDED
 	select a new item if selection is empty.