[Bug 219933] bsd diff: --suppress-common-lines // -y/--side-by-side not implemented

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219933

            Bug ID: 219933
           Summary: bsd diff: --suppress-common-lines // -y/--side-by-side
                    not implemented
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

I use `--suppress-common-lines -y` frequently to compare two files with diff.
This isn't currently implemented in bsd diff:

$ gdiff -y --suppress-common-lines A B
A                                                             | D
C                                                             | E
$ diff -y --suppress-common-lines A B
diff: invalid option -- y
usage: diff [-abdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            [-I pattern] [-L label] file1 file2
       diff [-abdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            -C number file1 file2
       diff [-abdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]
            [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2
       diff [-abdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]
            -U number file1 file2
       diff [-abdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]
            [-S name] [-X file] [-x pattern] dir1 dir2

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