phabricator: prevent posting obsolete commits I don't see why this would be useful in the first place. But I had a coworker submit a single commit that was not a branch head, and the result was to orphan its child and keep the original commit visible. He then did up arrow + Enter, and it happily created a new review (since the URL isn't amended into the original commit specified on the command line) and a new successor, resulting in a local divergence. I'd like to fix the issue with creating orphans, but this is simple enough to prevent on its own. Differential Revision: https://phab.mercurial-scm.org/D8437

phabricator: avoid creating unstable children within the review stack The instability occurred when rebasing something that has already been submitted onto something that hasn't, and then resubmitting the stack. Or as the test shows, just resubmitting and including something earlier that wasn't previously submitted. There's a general case here where any children (not just the ones in the range of commits posted for review) should be re-stabilized. But handling the selected commits here will cause the `local:commit` node values that are tracked on Phabricator to be properly kept in sync. Differential Revision: https://phab.mercurial-scm.org/D8436

phabricator: add an option to fold several commits into one review (issue6244) Now that all of the pieces are in place, alter the user facing command to allow it. This is the default behavior when using `arc`, but I much prefer the 1:1 approach, and I'm tempted to mark this advanced to limit its abuse. I started out calling this `--no-stack` like the feature request suggested, but I found it less obvious (especially when writing the code), so I went with the `hg fold` analogue. This will populate the `Commits` tab in the web UI with the hash of each commit folded into the review. From experimentation, it seems to list them in the order they are received from the extension instead of the actual parent/child relationship. The extension sends them in sorted order, thanks to `templatefilters.json()`. Since there's enough info there for them to put things in the right order, JSON is unordered aside from lists (IIUC), and there doesn't seem to be any harmful side effects, I guess we write this off as their bug. It is simple enough to workaround by putting a check for `util.sortdict` into `templatefilters.json()`, and don't resort in that case. There are a handful of restrictions that are documented in the code, which somebody could probably fix if they're interested. Notably, this requires the (default) `--amend` option, because there's not an easy way to apply a local tag across several commits. This also doesn't do preflight checking to ensure that all previous commits that were part of a single review are selected when updating. That seems expensive. What happens is the excluded commit is dropped from the review, but it keeps the Differential Revision line in the commit message. Not everything can be edited, so it doesn't seem worth making the code even more complicated to handle this edge case. There are a couple of "obsolete feature not enabled but X markers found!" messages that appeared on Windows but not macOS. I have no idea what's going on here, but that's an unrelated issue, so I conditionalized those lines. Differential Revision: https://phab.mercurial-scm.org/D8314