title: How can I see a diff between merge commit and what would be an automatic merge of the same parents?
body: <p>I have a couple of bad merges in history (due to human error). I want a quick way to find out if I have more like these. In order to automate it, I want to see, for every merge commit, the difference between as if the merge would be performed automatically (with a given conflict resolution strategy) and what actually happened in a given merge.</p>
  
  <p>How can I do it?</p>