* window.c (enum window_part): Move to dispextern.h.
(coordinates_in_window): Use enum window_part member names instead of numbers to describe return value. (struct check_window_data): Change part member to window_part. (check_window_containing): Return window_part unaltered. (window_from_coordinates): Change part arg from int to enum window_part. Allow part arg to be null. All users changed.
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