Improve whitespace and unary keyword parsing
* lisp/progmodes/js.el (js--name-start-chars): Remove, adding these chars back to js--name-start-re. (js--name-start-re): Add chars back from js--name-start-chars. (js-jsx--tag-start-re): Improve regexp to capture the tag name (so it can be disambiguated from a unary keyword), to match newlines (which are common in this spot), and to require at least one whitespace character before the attribute name. (js-jsx--matched-tag-type): Ensure the “tag name” isn’t possibly a unary keyword. (js-jsx--self-closing-re, js-jsx--matching-close-tag-pos): Allow whitespace around “<” and “>”. * test/manual/indent/jsx-unclosed-2.jsx: Add tests for unary keyword and whitespace parsing.
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