VT notifier fix for VT switch

VT notifier callbacks need to be aware of console switches.  This is already
partially done from console_callback(), but at that time fg_console, cursor
positions, etc.  are not yet updated and hence screen readers fetch the old
values.

This adds an update notify after all of the values are updated in
redraw_screen(vc, 1).
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/vt.c

@@ -702,6 +702,7 @@ void redraw_screen(struct vc_data *vc, int is_switch)
 	if (is_switch) {
 		set_leds();
 		compute_shiftstate();
+		notify_update(vc);
 	}
 }