[bug #58933] [PATCH] doc/groff.texi, man/groff.7.man: clarify description of \&

[Peter Schaffter]

Follow-up Comment #3, bug #58933 (project groff):


> It's Peter's term; I'm just a fanboy.  I agree that "zero-width" seems
redundant, but maybe he can think of something additional it communicates.

It's the definition used by Ossana and Kernighan in the cstr54, not mine,
though they switch it around.  I'm inclined to think zero-width is not
redundant, since a non-printing character could have a width.  Zero-width,
non-printing clarifies this.  I'd rather risk overstating than leaving room
for doubt. I suspect that was O&K's reasoning, too. 

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