Summary: Ref T5197. When searching for split branch heads, we incorrectly consider descendant heads of other branches. This can cause us to detect a split tip when one does not exist (the old tip is the branch tip, but other descendant heads exist). Instead, consider only heads on the same branch.
Test Plan:
Repro is something like this:
- `hg update default`
- `hg branch branch1; hg commit ...`
- `hg push`
- `hg update default; hg commit ...`
- `hg push` - Previously, we would find the head of `branch1` and incorrectly account for it as a head of `default`.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T5197
Differential Revision: https://secure.phabricator.com/D9308
66af361f10