add set_cursor_pos() virtual method

add set_cursor_pos() virtual method

2001-03-14  HideToshi Tajima  <tajima@happy.sunsoft.eng.sun.com>

	* gtk/gtkimmulticontext.c (gtk_im_multicontext_set_cursor_pos):
	* gtk/gtkimcontext.c (gtk_im_context_set_cursor_pos):
	* gtk/gtkimcontext.h (struct _GtkIMContextClass): add
	set_cursor_pos() virtual method

	* modules/input/gtkimcontextxim.c (gtk_im_context_xim_class_init):
	(gtk_im_context_xim_set_cursor_pos): add implementation for
	set_cursor_pos() method

	* gtk/gtkentry.c (recompute_idle_func): set current cursor
	position to input methods