test: fix truncated comment in test The push is made to ensure repository are related. The comment in the initial changeset got truncated somehow.

clfilter: ensure context raise RepoLookupError when the revision is filtered Currently the code path of `changectx(filteredrepo, rev)` call `filteredrepo.changelog.node(rev)`. When `rev` is filtered this raise an unhandled `IndexError`. This case now raise a `RepoLookupError` as other error case do.

revlog: remove incancestors since it is no longer used

transplant: replace incancestors uses with ancestors