title: Single-file diff between two commits
body: <p>In github, is it possible to show the diff of a single file between two commits? </p>
  
  <p>One can readily diff two commits, and it is possible to link to the anchor for a specific file in those two commits, but all files are included in that view.  For example, <a href="https://github.com/adamginsburg/APEX_CMZ_H2CO/compare/a94a962db51e0f4e73ec3ba4170a0ca8269548da...adamginsburg:master#diff-22" rel="noreferrer">https://github.com/adamginsburg/APEX_CMZ_H2CO/compare/a94a962db51e0f4e73ec3ba4170a0ca8269548da...adamginsburg:master#diff-22</a></p>
  
  <p>I would like a similar view, but without the other files.</p>
  
  <p>(I know how to do this on the command line with git, but I want to share this link with collaborators, so the command line approach is not relevant for this question)</p>