tests: wider work around matching in test-narrow-shallow.t Since issue6150 is still not fixed, we have to accommodate a larger array of possible results. Otherwise we get frequent flakiness of local and CI runs. Differential Revision: https://phab.mercurial-scm.org/D9766

fuzz: try and ensure fuzzer tests run against the right python-config Also only under python 3. Differential Revision: https://phab.mercurial-scm.org/D9752

contrib: remove testing for `dirstate-tree` Rust feature This feature will be replaced in a few months, and served more as a proof-of-concept. Keeping it in CI when no one is using it anymore is just wasteful. Differential Revision: https://phab.mercurial-scm.org/D9716

perf: don't turn byte to string when formatting perfbranchmap I am not sure why this `str` all is there is the first place. Differential Revision: https://phab.mercurial-scm.org/D9751

branchmap: avoid ancestor computations in absence of non-continous branches The branchhead computation is one of the more heavy operations for bigger repositories as it has to scan all changesets and potentially involves the expensive computation of the ancestor sets. Redo the computation to handle the common cases directly and use tighter conditions for when the ancestor scan is necessary. Most importantly, avoid it completely if the non-continous branches are processed in one update as seen in the initial computation after a clone. For the Mercurial repository, it gives a small 2-3% performance boost. For the NetBSD test repository, it cuts the time in half. Differential Revision: https://phab.mercurial-scm.org/D9631

persistent-nodemap: also list related file as part of the store This make sure they are will be selected during upgrade, and copy based clone. Differential Revision: https://phab.mercurial-scm.org/D9749