delta: have a native implementation of _findsnapshot The function might traverse a lot of revision, a native implementation get significantly faster. example affected manifest write before: 0.114989 after: 0.067141 (-42%)

transaction: do not overwrite atomic-temp files on error Even though the original files can be restored from the backup, it should be better to not write back a temporary file if we know it can be corrupted.

help: fix typo

rust: use 'impl Trait' in method argument of AncestorsIterator I just didn't know it's stabilized. Let's switch to new convenient syntax. Differential Revision: https://phab.mercurial-scm.org/D5451

rust: use .rev() for reverse range Differential Revision: https://phab.mercurial-scm.org/D5450

histedit: add warning message on editing tagged commits (issue4017) Differential Revision: https://phab.mercurial-scm.org/D5489

strip: extract bookmark movement into a separate function We will need it for the soft-strip case.

strip: compute bookmark target only if we have bookmark to move This is a small change that seems to make sense.

strip: extract code to create strip backup We will reuse this for soft stripping.

strip: clarify comment around bundle create We may create two bundles, one for the changeset actually stripped, and one for the changeset affected by the strip we want to keep. (Changesets with a higher rev number than the striped ones). For soft stripping, we still need to the first one (used for "restoring" the changesets), but not the second one. We start with clarifying which bits of the code is used for what.