follow--window-sorter

follow--window-sorter is a compiled Lisp function in `follow.el'.

(follow--window-sorter W1 W2)

Sorting function for W1 and W2 based on their positions.
Return non-nil if W1 is above W2; if their top-lines
are at the same position, return non-nil if W1 is to the
left of W2.