Make sure that the order of categories does not change after the first filter.
Make sure that the order of categories does not change after the first filter.

cogumbreiro/opam-coq-archive,mattam82/coq-opam-archive,ybertot/opam-coq-archive,ybertot/opam-coq-archive,gmalecha/opam-coq-archive,mattam82/coq-opam-archive,mattam82/coq-opam-archive,coq/opam-coq-archive,ybertot/opam-coq-archive,cogumbreiro/opam-coq-archive,gmalecha/opam-coq-archive,gmalecha/opam-coq-archive,cogumbreiro/opam-coq-archive