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bug#36702: 27.0.50; newline: don't auto-fill regardless of auto-fill-mod

From: Andreas Röhler
Subject: bug#36702: 27.0.50; newline: don't auto-fill regardless of auto-fill-mode
Date: Wed, 17 Jul 2019 12:19:00 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.7.2


have an auto-fill-function set in a mode.

When testing, noticed that  this auto-fill-function was called by  `newline` even if  no auto-fill-mode.

See definition of newline from simple.el, line 22:

(auto-fill-function (if arg nil auto-fill-function))

IMO there is also a docu bug, as this auto-filling is switched of by any arg

whilst docu says: With ARG, insert that many newlines -- which sounds unrelated if filling.

Herewith a test-command: inserts "foo" in a temp-buffer by just calling newline

(defun auto-fill-test()
  (let ((auto-fill-function (lambda ()(insert "foo"))))
      (switch-to-buffer (current-buffer))

GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.14.5) of 2019-06-04

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