title: TFS merge changeset into file with pending change
body: <p>I have a feeling this is a very stupid question, but I can't find the answer anywhere.</p>
  
  <p>So we have a Dev branch and a QA branch. I merge a bunch of contiguous changesets from Dev into QA, and resolve conflicts. Now I want to merge in a later changeset, over the changes I just merged (not having checked in the changes from the first merge). No dice, says TFS:</p>
  
  <pre><code>The item $/My/Path/to/the/file.vb has an incompatible pending change.
  </code></pre>
  
  <p>What's its problem? Why won't it give me a merge conflict option to merge the new changeset to the files with the pending changes? I don't want to check in the first merge just so I can merge in another changeset.</p>