Fix unwarranted point movement after C-g

Fix unwarranted point movement after C-g

When the same buffer is displayed in more than one window,
redisplay temporarily moves point to the window-point when it
works on non-selected windows.  If we allow C-g to quit out of
redisplay_window in this situation, point will appear to have
moved to the window-point of that non-selected window, which is
unwarranted.  These changes prevent quitting in strategic places,
so that we never quit out of redisplay_window.
* src/xdisp.c (run_window_scroll_functions):
Prevent quitting while running window-scroll-functions, so that we
don't quit out of redisplay_window with temporarily moved point.
(redisplay_window): While redisplaying the mode line, prevent
quitting, to avoid exiting while point is temporarily moved.
(decode_mode_spec): Use safe_call1 instead of call1, to trap any
errors instead of letting them throw out of redisplay.  (Bug#44448)