BF: rerun --report: Restore diff value to original form #3873
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When we started storing the diff() results in 168c49e (NF: rerun:
Add --report, 2018-05-22), the results didn't include unchanged files.
However, the new diff() command---merged with 50beb3b (RF: Aborb
rev-diff, 2019-04-30)---returns an entry for all files in the working
tree, with unchanged files having a state of "clean".
Filter these out to restore the original behavior and avoid dumping a
large amount of uninteresting information to
rerun --report
callers.