[bug #50778] .ta documentation does not match behavior

[Dave]

URL:
  <http://savannah.gnu.org/bugs/?50778>

                 Summary: .ta documentation does not match behavior
                 Project: GNU troff
            Submitted by: barx
            Submitted on: Mon 10 Apr 2017 07:35:42 AM CDT
                Severity: 3 - Normal
              Item Group: Incorrect behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

This report applies to groff 1.22.3.  The same issue exists in the latest
groff in git.

The .ta section of the info manual states, "The start-up value of [.ta in]
`gtroff' is `T 0.8i'."

However, this is not what groff itself reports:

$ echo '.tm \n[.tabs]' | groff -T ps
T36000u
$

Since the ps device has a resolution of 72000 units per inch, 36000u
corresponds to 0.5i, not 0.8i.

I don't know which value is correct, only that they don't agree.




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