narrow: detect if narrowspec was changed in a different share With this commit, `hg share` should be usable with narrow repos. Design explained on https://www.mercurial-scm.org/wiki/NarrowSharePlan I was running into cache invalidation problems when updating the narrowspec. After spending a day trying to figure out a good solution, I resorted to just assigning repo.narrowpats and repo._narrowmatch after invalidating them. Differential Revision: https://phab.mercurial-scm.org/D5278

tests: add test for narrow+share For how narrow+share is supposed to work, see https://www.mercurial-scm.org/wiki/NarrowSharePlan. Differential Revision: https://phab.mercurial-scm.org/D5276

narrow: keep narrowspec backup in store As suggested by Yuya in review of D4099. Differential Revision: https://phab.mercurial-scm.org/D5470

tests: update narrowspec when narrowspec, not dirstate, is accessed test-narrow-expanddirstate.t mimics a Google-internal extension that updates the narrowspec whenever the dirstate is accessed. Since 1d09ba0d2ed3 (narrow: move remaining narrow-limited dirstate walks to core, 2018-10-01) and a few commits before it, we no longer restrict repo.dirstate.walk() to the narrowspec. It is instead done at a higher level (e.g. context.status()). We were running into problems with the Google-internal extension when importing those commits. The issue was that the narrowspec was read before the first dirstate access. I believe the right fix is to instead update the narrowspec when trying to read it (not when reading the dirstate), so that's what this patch does. Differential Revision: https://phab.mercurial-scm.org/D5275

merge: extract helper for creating empty "actions" dict Replicating the set of actions in multiple places is bad. Differential Revision: https://phab.mercurial-scm.org/D5472

manifest: accept narrowmatch into constructor instead of getting from repo The manifest should ideally not know at all about the repo, so this is just a little step towards cleaning that up. Differential Revision: https://phab.mercurial-scm.org/D5469

py3: byteify one more sys.argv in gendoc.py

test: introduce a new flag to display env variable line per line It's easier to conditionalize some of the environment variables per Mercurial version once there is only one value per line. Differential Revision: https://phab.mercurial-scm.org/D5453

revlog: add an explicit test for `issnapshot` We test the method on a real revlog containing "real" data.

revlog: add some direct testing of the slicing logic This test check slicing backed by an actual revlog. It will test the C version of slicing (if the test are run with the C extensions).