mandoc/nroff small spacing difference for .Bd -offset 0

[Nicolas Joly <njoly@pasteur.fr>]

Hi,

Still checking the NetBSD man pages i noticed a minor difference for
display blocks with an `-offset 0' argument.

nroff displays it as if there wasn't an offset argument, but mandoc do
adds an extra leading space.

njoly@lanfeust [tmp/mandoc]> cat sample.1
.Dd October 16,2012
.Dt SAMPLE 1
.Os
.Sh NAME
.Nm sample
.Nd sample description
.Sh DESCRIPTION
.Bd -literal
Bd no offset
.Ed
.Bd -literal -offset 0
Bd offset 0
.Ed

njoly@lanfeust [tmp/mandoc]> nroff -mandoc sample.1 | grep Bd
     Bd no offset
     Bd offset 0

njoly@lanfeust [tmp/mandoc]> mandoc sample.1 | grep Bd
     Bd no offset
      Bd offset 0

Not a big deal as removing the offending offset argument will produce
a consistent output with both formatters, but wanted to report it
anyway.

Thanks.

-- 
Nicolas Joly

Biology IT Center
Institut Pasteur, Paris.
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