Subject: bug#21766: 25.0.50; delete-trailing-whitespace sometimes deletes non-whitespace

From: Stefan Monnier <[email-masked]>
Date: Wed, 28 Oct 2015 15:19:58 -0400

>> (save-match-data
>> (skip-syntax-backward "-" (line-beginning-position)))
[...]
> Ok, I see it now, it is the new parse_sexp_propertize stuff which is
> called by SETUP_SYNTAX_TABLE.

Indeed, internal--syntax-propertize needs to be fixed so it preserves
the match-data!

        Stefan