Merge branch 'en/merge-recursive-directory-rename-fixes'

When all files from some subdirectory were renamed to the root directory, the directory rename heuristics would fail to detect that as a rename/merge of the subdirectory to the root directory, which has been corrected. * en/merge-recursive-directory-rename-fixes: t604[236]: do not run setup in separate tests merge-recursive: fix merging a subdirectory into the root directory merge-recursive: clean up get_renamed_dir_portion()