wireprotopeer: clarify some variable names now that we allow snake_case "encargsorres" is hard to parse ("encarg sorres" sounds like it might be Spanish to me, and indeed Google Translate tells me that it's Catalan for "order sands"). Let's clarify with some added underscores and longer names. Differential Revision: https://phab.mercurial-scm.org/D9973

copy-tracing: add a --compute flag to debugchangedfiles This will help analysis of possible misbehaving cases. Differential Revision: https://phab.mercurial-scm.org/D9946

bundle2: print "error:abort" message to stderr instead of stdout It seems like the server's message is something you'd like to see even with `--quiet`. It's clearly part of the error. Differential Revision: https://phab.mercurial-scm.org/D9954

narrow: add --no-backup option for narrowing Most of our users at Google use Mercurial on a file system that keeps backups of previous versions of all files, including those in `.hg/`. They therefore don't need a separate backup in the file system when narrowing their repo (which they typically do by running `hg tracked --auto-remove-includes`). Backups can be very slow. `hg strip` already has a `--no-backup` option. This patch adds the same option to `hg tracked --removeinclude/--addexclude`. Differential Revision: https://phab.mercurial-scm.org/D9951

debugdiscovery: add flags to run discovery on subsets of the local repo Generating new repository using strip of local clone is very expensive for large repositories. And such large repository are the most likely to requires debugging around discovery. So we add a simple way to run discovery using provided sets of heads. Differential Revision: https://phab.mercurial-scm.org/D9945

cmdutil: add a missing byte prefix to string introduce in 976b26bdd0d8 The change is missing a the `b'foo'` prefix to make it a bytestring. This lead to a traceback in some third party extension. It is unclear to me why the Mercurial test pass without it. Differential Revision: https://phab.mercurial-scm.org/D9974

relnote: remove the reference to `debugstrip` The `debug` namespace is not intended for end user and advertising it is a path to confusion and trouble. I think we should wait for the `admin` namespace to exists and the command to be available as `admin--strip` before we advertise it. Differential Revision: https://phab.mercurial-scm.org/D9817

branching: merge with stable

upgrade: implement partial upgrade for upgrading persistent-nodemap Upgrading repositories to use persistent nodemap should be fast and easy as it requires only two things: 1) Updating the requirements 2) Writing a persistent-nodemap on disk For both of the steps above, we don't need to edit existing revlogs. This patch makes upgrade only do the above mentioned two steps if we are only upgarding to use persistent-nodemap feature. Since `nodemap.persist_nodemap()` assumes that there exists a nodemap file for the given revlog if we are trying to call it, this patch adds `force` argument to create a file if does not exist which is true in our upgrade case. The test changes demonstrate that we no longer write nodemap files for manifest after upgrade which I think is desirable. Differential Revision: https://phab.mercurial-scm.org/D9936

tests: unquiet a test to show changes in next patch Differential Revision: https://phab.mercurial-scm.org/D9935