title: Configure git difftool to edit an uncommited file?
body: <p>I'd like to compare two files, one file is in another branch and the other is the uncommitted version of the same file in the current branch.  So I do :</p>
  
  <pre><code>git difftool other_branch_name file_to_compare
  </code></pre>
  
  <p>now I want to edit uncommitted version in the current branch but I can't because vimdiff is opened in read-only mode... </p>
  
  <p>So what's the solution to use git difftool and allow modification ?</p>