Fix sgml-mode handling of quotes within parens (Bug#36347)
* lisp/textmodes/sgml-mode.el (sgml-syntax-propertize): Use syntax-ppss-table if set. This is only needed on the release branch, on master the caller (syntax-propertize) already does this. (sgml-mode): Set syntax-ppss-table to sgml-tag-syntax-table. This correctly classifies parens as punctuation, so they won't confuse the parser. * test/lisp/textmodes/sgml-mode-tests.el (sgml-tests--quotes-syntax): New test copied from master, with two cases added for this bug.
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