Finish replacing SGML-based JSX detection with js-mode’s parsing
This removes the last dependency on sgml-mode for JSX-related logic. * lisp/progmodes/js.el (js-jsx--start-tag-re) (js-jsx--end-tag-re): Remove. (js-jsx--looking-at-start-tag-p) (js-jsx--looking-back-at-end-tag-p): Reimplement using text properties, using syntax information which ought to be slightly more accurate than regexps since it was found by complete parsing.
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