Identify JSX strings (for js2-mode)
* lisp/progmodes/js.el (js-jsx--syntax-propertize-tag): Derived modes like js2-mode may use font-lock-syntactic-face-function to apply faces to JSX strings (and only JSX strings). Apply the js-jsx-string text property to such strings so they can be distinctly identified. (js-jsx--text-properties): Ensure the js-jsx-string text property gets cleaned up, too.
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