;; Check if the non-preferred merge has been modified since originally set.
;; This affects only the regions that are marked as default-A/B or combined.
;; If PREFERS-TOO is non-nil, then look at the regions marked as prefers-A/B as
;; Check if the non-preferred merge has been modified since originally set.
;; This affects only the regions that are marked as default-A/B or combined.
;; If PREFERS-TOO is non-nil, then look at the regions marked as prefers-A/B as