Use most-recently used window for other scrolling

Taken from [the Emacs Window Management Almanac][1], for trying it out.

[1]: https://karthinks.com/software/emacs-window-management-almanac/#scroll-other-window--built-in

init.el

@@ -2496,6 +2496,11 @@ Note that this workaround is incomplete, as explained in this comment."
 
 ;;* Navigation
 
+(setopt other-window-scroll-default #'(lambda ()
+                                        (or (get-mru-window nil nil 'not-this-one)
+                                            (next-window)
+                                            (next-window nil nil 'visible))))
+
 (use-package ace-window
   :ensure t
   :commands (ace-window