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Fix --diff output when encountering EOF (#1328)

`split("\n")` includes a final empty element `""` if the final line
ends with `\n` (as it should for POSIX-compliant text files), which
then became an extra `"\n"`.

`splitlines()` solves that, but there's a caveat, as it will split
on other types of line breaks too (like `\r`), which may not be
desired.

Fixes #526.

2 of 2 new or added lines in 1 file covered. (100.0%)

3348 of 3495 relevant lines covered (95.79%)

2.87 hits per line