[Bug 253413] pr(1) sometimes characters in multicolumn mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253413

            Bug ID: 253413
           Summary: pr(1) sometimes characters in multicolumn mode
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: leonard.r.koenig at googlemail.com

Hello,

I've found that when using pr(1) with multiple columns and using tabs, it may
cut
off output "too early".  Consider the following file:

123456781234567812345678123456781
x       x       x       x       x
123456781234567812345678123456781
x       x       x       x       x

where we have "x\tx\tx\tx\tx" and run it through pr(1):

    $ pr -t -2 foo

The output is

123456781234567812345678123456781   123456781234567812345678123456781
x       x       x       x          x       x       x       x

I.e., missing a final x below the last '1' in each column.  As each line is of
the same length, this shouldn't happen(?).

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