Do you know a simple way to tell GNU Emacs to recognize LaTeX
\iffalse ... \fi blocks and to display them in a special way, e.g., using a lighter font, or using font-lock-comment-face. Is there a LaTeX style package that already knows how to do this?
I understand that correctly recognizing valid
\iffalse's and their matching
\fi's in arbitrary LaTeX source file is a non-trivial problem, but I am happy with an approximate solution that works in most easy cases, e.g., that assumes no nesting of
\if\fi's and requires these commands to appear alone on their source line.