From mboxrd@z Thu Jan  1 00:00:00 1970
From: Carlos Pita <carlosjosepita@gmail.com>
Subject: Re: Bug: Add option to fontify latex blocks [9.1.9
 (release_9.1.9-65-g5e4542 @
 /home/carlos/local/stow/emacs-26/share/emacs/26.1.50/lisp/org/)]
Date: Mon, 3 Dec 2018 01:18:37 -0300
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To: emacs-orgmode@gnu.org

> the extension function becomes helpful again: this because the
> #+BEGIN/#+END matcher is incremental and eventually the region to

Well, on a closer inspection it's not that incremental, it's just
ignoring the limit...

(defun org-fontify-meta-lines-and-blocks-1 (limit)
      ....
      (when (re-search-forward
         (concat "^[ \t]*#\\+end" (match-string 4) "\\>.*")
         nil t)  ;; on purpose, we look further than LIMIT
       ....

This is against the rules! But if it's allowed here it should be
allowed in org-do-latex-and-related by the same token, shouldn't it?

So in order to get all this properly working:

1. Also ignore the limit in org-do-latex-and-related.

2. Install a region extension function so that multiline regions are
properly identified at the start and after syntax breaking change
(that is, at the beginning or at the end).