[bug #65654] preconv.cpp: Issue a warning if code '0xA0' is used in the input and thus changed to '\~'

[G. Branden Robinson]

Update of bug #65654 (group groff):

              Item Group:                    Lint => Warning/Suspicious
behaviour
                  Status:                    None => Need Info              

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Follow-up Comment #1:

Changing item group because this is a request for a new diagnostic message.

I don't understand the request, though.

`\~` is "displayed" as a normal space, too, if filling is off, or, depending
on circumstances (especially on terminals) if it's not adjusted sufficiently
to be distinguishable from a normal space.

Not sure why this is something worth warning about.

I will take this opportunity to note that if I ever implement my
"AT&T-compatible troff preconv output" flag, we should convert U+00A0 to `\ `
instead.


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