Propertize operator symbol names with symbol syntax class
* lisp/progmodes/ruby-mode.el (ruby-syntax-propertize): Do it here. (ruby-font-lock-keywords): Instead of handling them here. Leave highlighting them to the "normal" matcher, because now we can. (ruby-smie--forward-token, ruby-smie--backward-token): Likewise, don't special-case operator symbols anymore. (ruby-smie--args-separator-p): Simplify the regexp, match operator names with \s_. (ruby-smie--implicit-semi-p): Handle the special cases of ? and = at EOL the same way: check if the character has been assigned the symbol syntax class by syntax-propertize.
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