patchbomb: make --outgoing ignore secret changesets getoutgoing() is just rewritten almost like revset.outgoing(), a follow-up will make it use revsets after the tests are adjusted.

merge with stable

convert: make filemap renames consistently override revision renames When the source repository had a revision renaming "$new -> $old", but the filemap a "$old -> $new" rename, the converted revision could use either $new (deleting the file) or $old (keeping the file) when getting the file data, depending on the lexicographical order of those names. So the resulting revision would leave some files untouched (as expected), but delete others arbitrarely.

obsolete: compute extinct changesets `extinct` changesets are obsolete changesets with obsolete descendants only. They are of no interest anymore and can be: - exclude from exchange - hidden to the user in most situation - safely garbage collected This changeset just allows mercurial to detect them. The implementation is a bit naive, as for unstable changesets. We better use a simple revset query and a cache, but simple version comes first.

push: refuse to push unstable changesets without force User should resolve unstability locally before pushing the same way we encourage user to merge locally instead of pushing a new remote head. If we are to push obsolete changeset, at least one set of the pushed set will be either obsolete or unstable. The check is narrowed to only heads.

obsolete: compute unstable changeset An unstable changeset is a changeset *not* obsolete but with some obsolete ancestors. The current logic to decide if a changeset is unstable is naive and very inefficient. A better solution is to compute the set of unstable changeset with a simple revset and to cache the result. But this require cache invalidation logic. Simpler version goes first.

revset: add an `obsolete` symbol This predicate matches obsolete changesets. This is a naive implementation to be improved later.

push: refuse to push obsolete changesets This is a first version. Simple but not very efficient. Note that this changeset introduce the "obsolete" word in the UI.