When polling for changes, the Mercurial SCM Plugin lists changesets which are not on the branch configured in the job.

We are using branch namespacing similar to what is possible in git, so we name branches like "default/fixes/issue-123" ("Fix for issue 123 targeting default."). When polling for changes on "default", also those changes made on "default/fixes/issue-123" are found and listed, although the job is configured to only poll the "default" branch.