The in-progress/in-review Changes tab was inflating file counts by
preferring a stale task.baseCommitSha over the live merge-base with the
base branch. Once upstream commits are merged into a feature branch,
baseCommitSha..HEAD includes every upstream file as well, producing
counts far larger than the branch's own changes.
resolveDiffBase now prefers merge-base(HEAD, [origin/]baseBranch), falling
back to baseCommitSha only when no merge-base is available or when the
merge-base equals HEAD (task sitting on the base branch with no
divergence, e.g. unit-test scenarios).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
