[jayhemnani9910]

With -J, pr drops the separator between columns and between merged files, so the columns run together:

$ printf '1\n2\n3\n4\n' | pr -2 -t -J -S,
GNU 9.7:  1,3        uutils:  13
          2,4                 24

-J only turns off truncation and column alignment. get_line_for_printing skipped the separator whenever join_lines was set; it now writes it like in the other modes, and the unused join_lines field is gone.

joined.log.expected (-J -m on two files) had the merged lines glued together (# Host DatabaseMon Dec 10 ...); GNU writes a tab between them. The fixture now has that tab and is otherwise unchanged. New test test_join_lines_keeps_column_separator checks -2 -J with and without -S,. Both tests fail on main; the pr tests pass (85), clippy is clean. Also seen on 0.10.0.

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[github-actions]

Binary size comparison:

Individual binary size comparison VS main (threshold: >=5% AND >=4 KB).

Total size of compared binaries: 155.04 MB (-308 KB, -0.19%)

Significant per-binary changes:
  date     2.61 MB ->    2.30 MB  (-316 KB, -11.81%)

[sylvestre]

Thanks for your PR