Merge branch 'mm/mv-file-to-no-such-dir-with-slash' into maint

"git mv A B/", when B does not exist as a directory, should error out, but it didn't. * mm/mv-file-to-no-such-dir-with-slash: mv: let 'git mv file no-such-dir/' error out on Windows, too mv: let 'git mv file no-such-dir/' error out