Keep nxml prolog updated via syntax-propertize
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.
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