(font-lock-keywords): Fix doc for multiline matches.
(font-lock-add-keywords): Make it work even if font-lock-mode is nil, so that it can be used more easily in <foo>-mode-hook. Also make sure to avoid duplicate entries. (font-lock-update-removed-keyword-alist): Renamed `major-mode'->`mode'. (font-lock-remove-keywords): Just as was done for `add', allow it to work even if font-lock-mode is nil. Also make sure we don't modify any pre-existing list by forcing a copy-sequence. Finally rename `major-mode' to `mode'. (font-lock-fontify-syntactic-anchored-keywords) (font-lock-fontify-anchored-keywords) (font-lock-fontify-keywords-region): Use line-end-position. Don't make `font-lock-multiline' local (it's now done in font-lock-set-defaults). (font-lock-set-defaults): Make `font-lock-multiline' local. Also move the `font-lock-fontified' creation to inside the `unless'.
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