(syms_of_window): Initialiaze it. (check_all_windows): Add return type void. (window_fixed_size_p): New. Return non-zero if window is fixed-size. (window_min_size_1): New. (window_min_size): Handle fixed-size windows. (size_window): New. Rewritten combination of set_window_height and set_window_width that handles fixed-size windows. (set_window_height): Call it. (set_window_width): Call it. (Fsplit_window): Give an error on attempt to split a fixed-size window. (change_window_height): Partly rewritten to handle fixed-size windows.
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