Implement Occur multi-line matches.
http://lists.gnu.org/archive/html/emacs-devel/2010-03/msg01044.html * replace.el (occur): Doc fix. (occur-engine): Set `begpt' to the beginning of the first line. Set `endpt' to the end of the last match line. At first, count line numbers between `origpt' and `begpt'. Split out code from `out-line' variable to new let-bindings `match-prefix' and `match-str'. In `out-line' add non-numeric prefix to all non-first lines of multi-line matches. Finally, count lines between `begpt' and `endpt' and add to `lines'.
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