Variable: view-half-page-size
view-half-page-size is a buffer-local variable defined in view.el.gz.
Documentation
Default number of lines to scroll by View half page commands.
If nil that means use half the window size.
Source Code
;; Defined in /usr/src/emacs/lisp/view.el.gz
(defvar-local view-half-page-size nil
"Default number of lines to scroll by View half page commands.
If nil that means use half the window size.")