Instead of using after-change-functions. Also, stop consulting
nxml-prolog-regions during syntax-propertize. It turns out the
problems fixed by using prolog information are actually due to using
the wrong syntax table during propertizing. This was fixed in
2019-06-04 "* lisp/emacs-lisp/syntax.el: Use syntax-ppss-table for
syntax-propertize." so consulting the prolog data is no longer needed.
* lisp/nxml/nxml-rap.el (nxml-maybe-rescan-prolog): Remove.
* lisp/nxml/nxml-mode.el (nxml-mode): Stop using it.
(nxml-syntax-propertize): Don't use nxml-prolog-regions, just call
nxml-scan-prolog if needed before delegating to
sgml-syntax-propertize.
* test/lisp/nxml/nxml-mode-tests.el (nxml-mode-edit-prolog): New test.
* lisp/nxml/nxml-mode.el (nxml-syntax-propertize): New function.
(nxml-mode): Use it as the syntax-propertize-function.
* test/lisp/nxml/nxml-mode-tests.el (nxml-mode-doctype-and-quote-syntax)
(nxml-mode-prolog-comment): New tests.
* lisp/textmodes/sgml-mode.el (sgml-specials): Add single quote.
(sgml-syntax-propertize-rules): Handle single quote.
* test/lisp/nxml/nxml-mode-tests.el (nxml-mode-font-lock-quotes): New
test.
* test/lisp/textmodes/sgml-mode-tests.el
(sgml-delete-tag-bug-8203-should-not-delete-apostrophe): Now passes.
The change from 2016-01-16 "lisp/nxml: Use syntax-tables for comments"
made nxml-get-inside return non-nil for any string or comment,
including attribute strings. This caused incorrect and therefore
indentation.
* lisp/nxml/nxml-rap.el: Update commentary to reflect changes to
nxml-mode parsing.
(nxml-get-inside): Only return non-nil when inside comments and
generic strings, not normal quote-delimited strings.
* test/lisp/nxml/nxml-mode-tests.el: New tests.
