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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: auto fill-paragraph
Date: Mon, 19 Nov 2012 09:57:14 -0500
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There's an important element you do not discuss in your description of
what you want: do you want the "line-wrapping" to be done on the
buffer's content (so that the saved file does not contain lines longer
than 75 chars), or only on its rendering on screen?

auto-fill-mode and M-q modify the actual buffer content, whereas things
like visual-line-mode only affect the display rendering.

There are ways to trick the rendering engine to do the line-wrapping at
a particular column (e.g. the same column as fill-column).  The simplest
way is to resize the window.


        Stefan