* src/xdisp.c (select_frame_for_redisplay): Use select_window_1 to

* src/xdisp.c (select_frame_for_redisplay): Use select_window_1 to
propagate redisplay's scrolling (if any) to the right window.
(redisplay_internal): Use ensure_selected_frame.
(display_mode_lines): Complete last fix.
* src/window.c (select_window_1): New func, extracted from select_window.
(select_window): Use it.
* src/window.h (select_window_1): Declare.