evolve: support ancestor of orphan split with unrelated changeset in between This is done by searching for roots and heads within the range delimited on both sides by the target revs instead of just within the target revs. Example: o 5 | o 4 | o 3 | | * 2 | | | x 1 |/ o 0 1 is obsoleted by 3 and 5. We are considering the case when 2 gets evolved. Before the change, both roots and heads were [3, 5]. The user was offered a choice between 3 and 5 as the destination. After the change, roots are [3] and heads are [5]. 5 is chosen as the destination.

exchange: deal with empty obscommon The case can happen, we better support it.

topic: compat with tr.changes[b'phases'], it's now a list

topic: fix compatibility issues caused because of change in transaction API In 36f08ae87ef687be53a59bd87376bcfbe4479205 in core mercurial, `_validator` attribute to transaction class was removed and a dict was introduced. It added a `addvalidator()` function to transaction class which can be used to register multiple validator callbacks. This updates the code to use `addvalidator()` when `_validator` attribute is not present.

obsexchange: fallback to simpler request for dumb http server If the http server cannot accept many arguments, avoid sending too large requests (at the cost of more data exchanged). A better solution would be to aggregate contiguous range, but this is a question for later.

obsexchange: swap the 'common' and 'missing' clause

obsdiscovery: avoid considering locally hidden changeset This looks like a dubious optimisation

obsdiscovery: add a test where some common node are hidden This is useful to prevent regression.

tests: use appropriate Python (2 or 3) for dummyssh

evolve: add missing 'of' in message The message refers to the changeset that is currently evolved. Therefore the message needs an additional 'of' to be correct.

test: fix graph label in test-push-checkheads-pruned-B5.t They were wrong.

readme: mention compat string format

readme: copywrite the section about branch policy, wrap long lines

compat: update hg-X.Y compat comments and test them

contrib: add a script to check release in compat comments that have node hash

changelog: add an entry about the cleanup

evolve: drop compat for pre-4.5 context.memfilectx()

compat: update a couple of obviously outdated version comments

evolve: drop pre 4.0 compat for dirstate.parentchange()

evolve: drop 4.5 compat for scmutil.resolvehexnodeidprefix()

evolve: drop 4.5 compatibility for patch in tryimportone()

evolve: drop 4.5 compatibility with `patch.extract` API

evolve: drop 4.5 compatibility for template keywords

topic: drop 4.5 compatibility for template keywords

compat: drop 4.5 compatibility for strdiff

compat: drop 4.5 compatibility layer for log utility

compat: drop 4.5 related compatibility around wireprotocol module

compat: directly use status attribute instead of the compat layer With 4.5 dropped, this compat layer is no longer needed.

compat: directly use function from dateutil Since support for 4.5 have been dropped we no longer needs this indirection.

compat: drop 4.5 compatibility for `_filterederror`