* lisp/emacs-lisp/smie.el (smie-auto-fill): Rework to be more robust.
(smie-setup): Use add-function to set it. * lisp/progmodes/octave.el (octave-smie-rules): Return nil rather than 0 after a semi-colon; it works better for smie-auto-fill. (octave--indent-new-comment-line): New function. (octave-indent-new-comment-line): Use it (indirectly). (octave-mode): Don't disable smie-auto-fill. Use add-function to modify comment-line-break-function.
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