phabricator: use parents.set to always set dependencies Now that Mercurial's Phabricator instance has been updated to a version that supports the parents.set transaction on revision.edit we can use that to set dependency relationships in patch stacks instead of abusing the summary. This has the advantage that we can use it on every `phabsend` so commit reordering is picked up without spamming changes like abusing the summary would, and using parents.set will clear previous parents unlike parents.add. Differential Revision: https://phab.mercurial-scm.org/D6514

help: remove repeated word in 'hg help rebase' Specifically, the second 'with' in 'with which to merge with'. Differential Revision: https://phab.mercurial-scm.org/D6483

rebase: tweak description of inmemory working even w/ dirty working dir One of our users was confused because they read this, and then attempted to run `hg rebase` with a dirty working directory, and it still complained. The reason was that they were attempting to rebase the commit they currently had checked out, which (at least with evolve workflows enabled) involves updating the working directory to be based on the newly rebased commit. Differential Revision: https://phab.mercurial-scm.org/D6507

revlog: speed up isancestor Currently, it is implemented on top of commonancestorsheads. Implement it on top of reachableroots instead, as reachableroots could stop walking the graph much sooner than commonancestorsheads. Measuring repo.changelog.isancestorrev on two revisions in a private repository: before: ! wall 0.005175 comb 0.010000 user 0.010000 sys 0.000000 (best of 550) after : ! wall 0.000072 comb 0.000000 user 0.000000 sys 0.000000 (best of 36199) When hg does this kind of operations 1500 times in pull -> bookmarks.comparebookmarks -> bookmarks.validdest, that's 11s that drop from the --profile output. Differential Revision: https://phab.mercurial-scm.org/D6506