evolve: don't warn about topics while resolving public content-divergence During content divergence resolution where one side is already published, we can hit a case when there is no actual content difference between the two changesets. Some of the metadata can be valuable, such as branch. But topics are only important for non-public changesets. warnmetadataloss() is trying to warn users about metadata "loss" during the resolution, but it only runs when one of the sides is published. So it shouldn't care about topics or topic namespaces.