repo: skip invalidation of changelog if it has 'delayed' changes (API) The changelog object can store recently added revisions in memory until the transaction is committed. We don't want to lose those changes even if repo.invalidate(clearfilecache=True), so let's skip the changelog when it has such 'delayed' changes. Differential Revision: https://phab.mercurial-scm.org/D152

httppeer: make several instance attributes internal (API) Peer instances are supposed to conform to a well-defined API so consumers can be agnostic about the underlying peer type. To reinforce this, this commit renames a handful of instance attributes on httpeer so they no longer have a "public" name. Differential Revision: https://phab.mercurial-scm.org/D268

httppeer: remove unused handler attribute The consumer of this attribute was removed by b6bd4ee6ed85 in 2008. Differential Revision: https://phab.mercurial-scm.org/D267

localrepo: remove unused requirements attributes on localpeer (API) The previous changeset removed the last consumer of requirements. I'm not sure when supportedformats became unused. But I couldn't find any obvious instances where it is being used. It likely stems from peers being derived from repository instances several years ago and is a holdover from that day. Differential Revision: https://phab.mercurial-scm.org/D266