Add regression tests for diff -uw issue reported by guenther@. Ensure the
'+' and '-' always appear in the first column of a newline in diff -uw
output, even when one file doesn't end with a newline

Add regression tests for diff -uw issue reported by guenther@. Ensure the
'+' and '-' always appear in the first column of a newline in diff -uw
output, even when one file doesn't end with a newline and the other file
contains additional lines.

ok guenther@

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