merge: don't check for unknown files in IMM Differential Revision: https://phab.mercurial-scm.org/D1214

rebase: enable multidest by default This was intended to be done by D470. But there was a minor documentation issue. The feature is quite usable now so it gets formally documented and enabled. There is no behavior change for people not using the `SRC` or `ALLSRC` in rebase destination revset. .. feature:: Rebase with different destination per source revision Previously, rebase only supports one unique destination. Now ``SRC`` and ``ALLSRC`` can be used in rebase destination revset to precisely define destination per each individual source revision. For example, the following command could move some orphaned changesets to reasonable new places so they become no longer orphaned:: hg rebase -r 'orphan()-obsolete()' -d 'max((successors(max(roots(ALLSRC) & ::SRC)^)-obsolete())::)' Differential Revision: https://phab.mercurial-scm.org/D1063

overlayworkingctx: make clean() public It will be called directly by rebase after concluding a node. Differential Revision: https://phab.mercurial-scm.org/D1230

overlayworkingctx: remove flushall() Differential Revision: https://phab.mercurial-scm.org/D1216

merge: skip subrepo state, update hooks, and updating the dirstate in IMM Differential Revision: https://phab.mercurial-scm.org/D1215

merge: remove calls to flushall() Since D1105, these are unnecessary since IMM will now never use workers. Differential Revision: https://phab.mercurial-scm.org/D1213

filemerge: raise InMemoryMergeConflictsError if we hit merge conflicts in IMM Merge conflicts might be supported in the future, but for now are kept out of scope. Any places where we used to call `flushall()` should be replaced with some kind of exception. At this point, IMM M1 is no longer supported. Differential Revision: https://phab.mercurial-scm.org/D1212

context: switch ctx() use to changectx() I added `ctx()` to `overlayworkingfilectx`, (and before that, `absentfilectx`), because `absentfilectx` had reference to this function in its `cmp()` function. But the standard is actually `changectx()`, and no other class implements `ctx()`. So let's use the standard name. (As a result, I'm not sure that part of the `absentfilectx` comparator ever worked! It was written before I added either function.) This will be necessary in the next patch. Differential Revision: https://phab.mercurial-scm.org/D1211

lfs: introduce a user level cache for lfs files This is the same mechanism in place for largefiles, and solves several problems working with multiple local repositories. The existing largefiles method is reused in place, because I suspect that there are other functions that can be shared. If we wait a bit to identify more before `hg cp lfutil.py ...`, the history will be easier to trace. The push between repo14 and repo15 in test-lfs.t arguably shouldn't be uploading any files with a local push. Maybe we can revisit that when `hg push` without 'lfs.url' can upload files to the push destination. Then it would be consistent for blobs in a local push to be linked to the local destination's cache. The cache property is added to run-tests.py, the same as the largefiles property, so that test generated files don't pollute the real location. Having files available locally broke a couple existing lfs-test-server tests, so the cache is cleared in a few places to force file download.

largefiles: refactor _usercachedir() to allow reuse with lfs Largefiles puts everything into a flat directory, while lfs divides files up by creating subdirectories consisting of the first two characters of the hash. Therefore, pointing at the largefiles cache won't work.