(hs-set-up-overlay): New user var.
(hs-make-overlay): New function. (hs-isearch-show-temporary): Handle `display' overlay prop specially. (hs-flag-region): Delete function. (hs-hide-comment-region): No longer use `hs-flag-region'. Instead, use `hs-discard-overlays' and `hs-make-overlay'. (hs-hide-block-at-point): Likewise. (hs-hide-level-recursive): Use `hs-discard-overlays'. (hs-hide-all, hs-show-all): Likewise. (hs-show-block): Likewise. Also, use overlay prop `hs-b-offset', not `hs-ofs'.
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