fileset: drop 'group' node from tree to be evaluated This helps rewriting a parsed tree.

fileset: add phase to transform parsed tree This isn't strictly necessary, but I decided to just follow the strategy of the revset parsing.

py3: whitelist another 3 tests caught by the ratchet Differential Revision: https://phab.mercurial-scm.org/D4069

testrunner: allow multiple #testcases This lets you have multiple #testcases declarations and they're taken to be different dimensions of the test, so their cross product becomes the total set of test cases. For example: #testcases obsstore-on obsstore-off #testcases manifest-flat manifest-tree $ hg rebase ... ... #if obsstore-on $ hg log ... #endif Note that this is an excellent way to slow down the test suite, so use it with care. The feature is implemented by replacing most of the "case" variables that were strings before by an array of strings with each item a different dimension of the test case. The file names are created by joining the dimensions by "#" (e.g. test-foo.t#obsstore-on#manifest-flat). Differential Revision: https://phab.mercurial-scm.org/D4049

testrunner: use "#" for "test cases" suffix in .err filename too This seems like a natural follow-up to b865bba56db1 (run-tests: update the test case name format, 2018-05-13). Differential Revision: https://phab.mercurial-scm.org/D4052

resolve: add confirm config option This config setting gives a functionality to confirm before it re-merge all unresolved files. If this config is enabled, when you run 'hg resolve --all' it will prompt with a msg "re-merge all unresolved files (yn)?" To enable this functionality: [commands] resolve.confirm = True Differential Revision: https://phab.mercurial-scm.org/D3988

revlog: remove side effect from failed nt_init() If nt_init() successfully allocates memory for the node tree but then runs out of memory while trying to insert nullid into it, it will leave the node tree pointer set on the index object. That means that future node tree operations will think that the tree is properly initialized. It seems very unlikely to make a difference in practice (if nt_init() runs out of memory, not much else will probably work), but since I spotted it, I figured I might as well fix it. Differential Revision: https://phab.mercurial-scm.org/D4028

revlog: remove micro-optimization for looking up only nullid index_find_node() would call nt_find() before initializing the node tree. nt_find() would then return -2 unless the requested revision was the null revision. I can't imagine what scenario that is optimizing for, and doing the initialization earlier makes the code simpler and easier to follow, so that's what this patch does. Differential Revision: https://phab.mercurial-scm.org/D4027