(auto_window_vscroll_p): New boolean.
(syms_of_window): DEFVAR_BOOL it. (Fpos_visible_in_window_p): Extend return value to include RTOP and RBOT values if FULLY is nil. (window_scroll_pixel_based): Adjust vscroll for partially visible rows if auto_window_vscroll_p is set. (Fset_window_vscroll): Do nothing if vscroll is not modified.
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