Properly set a dynamic, syntactic mode name
Use mode-line-format constructs to properly set mode-name, rather than use the very hacky solution that was filling-in for my lack of knowledge of this feature. * lisp/progmodes/js.el (js--update-mode-name) (js--idly-update-mode-name): Remove. (js--syntactic-mode-name-part): New helper function for mode-name. (js-use-syntactic-mode-name): Helper to set up the dynamic mode-name. (js-jsx-enable): Don’t need to call any extra functions now. (js-mode): Use the new setup function rather than the old ones. (js-jsx-mode): Use the same initial mode name as js-mode so the final one is identical for both modes.
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