debuginstall: use codecs.lookup() to detect invalid encoding encoding.fromlocal() never tries to decode an ascii string since 853574db5b12, and there's no universal non-ascii string which can be decoded as any valid character set.

extensions: fix wrapcommand/function of class instance 5361771f9714 changed _updatewrapper() to copy the __name__ attribute, but not all callable objects has __name__. Spotted by loading mq with extdiff.

changegroup: avoid creating empty changegroup part Previously this check happened in the changegroup code itself. Since its refactor, this logic needs to move out to callers that care about it, such as this one. Otherwise we get empty bundle devel-warnings in certain extensions. Differential Revision: https://phab.mercurial-scm.org/D690

tests: split test-revset.t in half This test has gotten so large that running it can exceed the normal timeout on systems under load (like if we're running all the tests in parallel). This patch splits the test cleanly in half. Differential Revision: https://phab.mercurial-scm.org/D694

merge: flush any deferred writes just before recordupdates() ``recordupdates`` calls into the dirstate which requires the files to be there, so this is the last possible moment we can flush anything. Differential Revision: https://phab.mercurial-scm.org/D673

merge: flush any deferred writes before, and after, running any workers Since we fork to create workers, any changes they queue up will be lost after the worker terminates, so the easiest solution is to have each worker flush the writes they accumulate--we are close to the end of the merge in any case. To prevent duplicated writes, we also have the master processs flush before forking. In an in-memory merge (M2), we'll instead disable the use of workers. Differential Revision: https://phab.mercurial-scm.org/D628

filemerge: flush if using deferred writes when running a merge tool Since merge tools might read from the filesystem, we need to write out our deferred writes here. No-ops if not using deferred writes. Differential Revision: https://phab.mercurial-scm.org/D627

merge: pass wctx to premerge, filemerge In the in-memory merge branch. we'll need to call a function (``flushall``) on the wctx inside of _xmerge. This prepares the way so it can be done without hacks like ``fcd.ctx()``. Differential Revision: https://phab.mercurial-scm.org/D449

cmdutil: fix amend when passing a date Following https://phab.mercurial-scm.org/D636, passing the same date that the changeset to amend would results in no new commits but the output changed from: $ hg amend -d '0 0' nothing changed [1] to: $ hg amend -d '0 0' Restore the old behavior by parsing the date passed as parameter so the condition "date == old.date()" correctly works in cases both dates are identical. Add a test for covering this regression. This bug was found thanks to Evolve test suite. Differential Revision: https://phab.mercurial-scm.org/D691

merge with stable