The format engine doesn't check for negative width, maybe it should.
According to the man page, wcwidth() returns -1 on error (really, that
means "not printable"). And it looks like negative return values from
wcwidth() are handled (although maybe not right).
For those having questions, in the nmh test directory there is a utility
called "getcwidth" that can tell you what wcwidth() will return for a
given character.
--Ken
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