This patch adds an option that will color triple-quoted strings
correctly. It works by turning off syntax-highlighting for strings and
comments (by registering quotes and hashes in the syntax table as
normal punctuation); and using a fairly advanced keyword matcher
to find all strings and comments. The keyword matcher uses a text-
property to keep track of the syntax category of each character, and
only updates it as needed. Therefore, the option can only be used if
text-properties are available (but they are available on all current
versions of emacs, as far as I know).
Caveat: it's possible that this will be slow on some machines, or
under certian circumstances. But it's not noticably slower on the
machines & files I've tested it on.
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