Handle quotation marks and apostrophes in ‘sgml-quote’
To be able to use text in an HTML argument, quotation marks need to be replaced with an appropriate character reference. Make ‘sgml-quote’ do that. While at it, fix entiteis not being unquoted if they lack closing semicolon (e.g. ‘&’) occuring at the very end of a region. Even though unlikely, make ‘sgml-quote’ handle this scenario. * lisp/textmodes/sgml-mode.el (sgml-quote): Handle quotation marks and apostrophes. Match entities lacking semicolon at the end of regions. * test/lisp/textmodes/sgml-mode-tests.el (sgml-quote-works): New test case for ‘sgml-quote’ function.
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