title: Diff current source vs source at point in time
body: <p>I <a href="https://stackoverflow.com/questions/2580662/how-to-view-mercurial-changeset-changes-using-a-gui-diff-tool">know</a> how to view all changes in a changeset..</p>
  
  <p>But let's say you update your source, you do a <code>pull</code> and you get 3 new changesets.  How can you compare the current state of the remote repository (with the 3 changesets checked in) vs. the current source (on your local machine)?  </p>
  
  <p>I'd like to do this using the visual diff tool which I currently have configured (Examdiff or Kdiff3).</p>