Merge branch 'ap/maint-diff-rename-avoid-overlap'

The logic used by "git diff -M --stat" to shorten the names of files before and after a rename did not work correctly when the common prefix and suffix between the two filenames overlapped. * ap/maint-diff-rename-avoid-overlap: tests: make sure rename pretty print works diff: prevent pprint_rename from underrunning input diff: Fix rename pretty-print when suffix and prefix overlap