On Sa, 02 Jan 2016, tot-to wrote:

> https://bugs.gentoo.org/show_bug.cgi?id=559800
> 
> Previously, I haven't set textwidth in .vimrc and it was no
> autowrapping by default in all files.
> 
> At some point (probably after an upgrade) it stared to do autowrap, but
> only for *.txt files, i.e. if I open such file and enter the
> command :set tw I get
> textwidth=78
> Of course, I can set it manually to 0, but it'll be forgotten on the
> next run. So, I've added this string to my ~/.vimrc: set textwidth=0
> But it turned out, that this doesn't change the behaviour at all.
> I've tested with latest versions for amd64 and ~amd64, i.e. 7.4.769 and
> 7.4.827.

My guess is, you have a filetype plugin for text files, that sets the 
textwidth. Check your :scriptnames output and as mentioned by Ken, use 
:verbose set tw?
to find out, where it was set.

> 
> Reproducible: Always
> 
> Steps to Reproduce:
> 1. echo 'set textwidth=0' >> ~/.vimrc
> 2. vim textfile.txt
> 3. type ":set textwidth"
> Actual Results:  
> textwidth=78

Please always start with an empty vimrc, e.g. vim -u NONE -N 

Also see the faq:
https://vimhelp.appspot.com/vim_faq.txt.html#faq-2.5

Best,
Christian
-- 
Ein Bundeswehrsoldat beraubt maskiert, aber in Uniform eine Bank; auf
der Brust prangt stolz sein Namensschild.

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