[bug #58581] [PATCH] doc/groff.texi, man/groff_font.5.man: spacewidth value is missing units

[Dave]

Follow-up Comment #5, bug #58581 (project groff):

[comment #4 comment #4:]
>   Actually the "spacewidth" can't have any absolute unit,
> as it must apply to any point size of a font;
> that is, a 10 point font must have a smaller space width than a 50
> point font.

Yes.  This is why I used the units of m in my original post.

>   I read the definition of "unitwidth", so then I understood, that the
> numbers in the font files are _relative_(!) to the "unitwidth" value.
> 
>   So the actual size of a space is "spacewidth / unitwidth" part of the
> point size of the font.

This bug concerns end-user documentation.  Such documentation should state the
unit as concisely as possible, without sacrificing any accuracy.  The
internals of how groff arrives at this unit are unimportant to end users.

Are there any situations where this calculation results in something other
than a unit of 1/1000 of an m for spacewidth?

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