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(window_from_coordinates, recombine_windows, set_window_buffer)
(make_parent_window, Fwindow_resize_apply, resize_frame_windows)
(Fsplit_window_internal, Fdelete_window_internal)
(freeze_window_starts): Use bool for booleans.
* window.h (window_frame_coordinates, resize_frame_windows)
(freeze_window_starts, set_window_buffer): Adjust prototypes.