test-compat: merge mercurial-4.6 into mercurial-4.5

test-compat: merge mercurial-4.7 into mercurial-4.6

test-compat: merge mercurial-4.8 into mercurial-4.7

test-compat: merge mercurial-4.9 into mercurial-4.8

test-compat: merge mercurial-5.0 into mercurial-4.9

test-compat: merge mercurial-5.1 into mercurial-5.0

test-compat: merge mercurial-5.2 into mercurial-5.1

test-compat: merge stable into mercurial-5.2

tests: use --tool flag instead of --config ui.merge Makes this test not fail on older hg versions.

evolve: remove a check which is already done by rewriteutil.precheck() We have tests to check if fold is being performed on public cset. There is no changes in test files because testing that never touched the part this patch removes, and already caught in rewriteutil.precheck()

test-compat: create a compatibility branch for Mercurial 5.2 Mercurial 5.3rc have been released, so the stable branch is no longer about 5.2.

contrib: make merge-test-compat.sh more topic-friendly

contrib: shellcheck merge-test-compat.sh

evolve: add pre-check logic for content-divergence in rewriteutil.precheck() For now, pre-check will abort if rewriting a rev create divergence (and config experimental.evolution.allowdivergence is not set to True). But this behaviour can be improved where instead of abort maybe we can confirm the user to either proceed with divergence or some other options depends on what command user is running. Changes in test file are used to overrides the pre-check for testing purpose (using experimental.evolution.allowdivergence=yes).

evolve: rename a function to make it explicit

obsdiscovery: compatibility when importing forcebytestr()

heptapod-ci: add pytype job, allow it to fail for now

evolve: add a new method picksplitsuccessor() in utility.py This patch adds the logic to return a single successor of a rev which was split. If split revisions are on a single topological branch then we return highest one; otherwise prompt user to choose an evolve destination.

changelog: add missing entries

compat: also import datestr from dateutil

obshistory: remove unused ismetablacklisted() Code that used this function was removed in 461b9a91b662. But we still need to add one item currently missing from METABLACKLIST in core: touch noise.

obshistory: remove unused successorsetallmarkers() This function was used in code that was removed in 901186e1fe05.

obshistory: remove unused _successorsetdates() and _successorsetusers() They were used by preparesuccessorset() that was removed in the previous patch.

obshistory: remove unused preparesuccessorset() It was used in code that was removed in 901186e1fe05.

obshistory: use effect flags from obsutil They were added there in 51aadc0d0da2::187bc224554a (hg 4.4).

obshistory: make a {flag value: description} dict for _markerseffects()

obshistory: factor out _markerseffects()

obshistory: factor out _markerspreciseverb()

evolve: provide branch argument to overlayworkingctx.tomemctx() This is related to upstream 2ecbc4ec87d8 and fixes test-evolve.t.

changelog: mention all the cleanups as one item