竖屏分屏浏览代码的快捷方式

Emacs-general
1

需要对照别人的代码完成一些工(chao)作(xi)时，希望不换到其他window就能翻页，scroll-other-window 可以实现这样的功能，只是粒度太大了，而有时只需要向下移动一行

(defun next-line-other-window ()
  (interactive)
  (other-window 1)
  (forward-line)
  (other-window -1))

(defun previous-line-other-window ()
  (interactive)
  (other-window 1)
  (forward-line -1)
  (other-window -1))
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