System for adding and removing keywords.
Both local (previously added keyword) and global keywords can be removed. (font-lock-remove-keywords): New user-level function. (font-lock-update-removed-keyword-alist): New internal function. (font-lock-removed-keywords-alist): New variable. (font-lock-add-keywords): Updates `font-lock-removed-keywords-alist'. Empty `font-lock-keywords-alist' when `append' is `set' to avoid growing datastructures. (font-lock-set-defaults): Removes keywords stored in `font-lock-removed-keywords-alist' after local keywords added. (c-keywords, c++-keywords): Better "case" support for complex constant expressions, e.g. "case 1<<A_BIT_NO:". (c-keywords): Only highlight preprocessor directives when spelled correctly. (font-lock-match-c++-structor-declaration, c++-keywords): Fontify constructors and destructors with function face inside C++ class declarations.
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