[bug#37465] add xftwidth displayed textwidth calculator package

[Tobias Geerinckx-Rice]

Kyle,

Thanks for the patch.

Kyle Andrews 写道：
> I've fixed the notes I saw from guix lint:
>
> 1. https -> http for github urls

I thought this was just a typo, but the patch agrees.  Our linter 
doesn't recommend HTTP over HTTPS for GitHub (or indeed any) URLs. 
In fact, it should now warn about a

 gnu/packages/xftwidth@20170402: permanent redirect from
 http://github.com/vixus0/xftwidth to
 https://github.com/vixus0/xftwidth

Also, the GNU/Guix style is to…
- never use tabs for indentation, only spaces.
- use two spaces between prose sentences: ‘…Xft fonts.  It is…’.
                                                     ^^
The linter should have warned you about both of these, too.

It sounds like yours is behaving quite strangely.  What, exactly, 
did it say?

Kind regards,

T G-R

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