如何进行基于变更集的合并而不是基于Mercurial的基于文件的合并？

When performing a merge with Mercurial, it wants to merge conflicting files one at a time which just isn't a productive workflow on large merge sets. Instead, what I would like to do is merge the entire changesets of both heads (like using kdiff3 to diff 2 heads). To me that sounds straightforward but I can't figure out how to achieve it.When performing a merge with Mercurial, it want