title: svn path not found on branch not involved in merge operation
body: <p>I am trying to merge a single file from my trunk up to a branch(wc) and am getting an odd path not found error for a path that looks to be on a branch not involved in the current merge operation.</p>
  
  <p>For example, in our svn project we have:</p>
  
  <ul>
  <li>branches
  <ul>
  <li>branch0</li>
  <li>branch1</li>
  <li>branch2</li>
  <li>branch3</li>
  <li>branch4</li>
  </ul></li>
  <li>tags
  <ul>
  <li>...[some tags]</li>
  </ul></li>
  <li>trunk</li>
  </ul>
  
  <p>I have checked out branch4 and it is my working copy.  After fixing a production bug on the trunk, I want to merge my change from the trunk into branch4.  I try to do this using the following command:</p>
  
  <pre><code>svn merge https://svn.svnprovider.com/my-account/my-project/trunk/path/to/file/my-file.java path/to/file/my-file.java
  </code></pre>
  
  <p>I have done this with other files without issue, however, for this file I get an error similar to:
  (proprietary info in real files and path, hence the example)</p>
  
  <p>svn: '/my-account/!svn/bc/1732/my-project/branches/<strong>branch1</strong>/path/to/file/my-file.java' path not found</p>
  
  <p>At one point in history branch1 was our working branch and it was re-integrated onto the trunk.  All branches, to my knowledge, have been created from the trunk and not from other branches.  So I am wondering first what is happening and second, how do I fix this.</p>
  
  <p>I have read several posts talking about svn:mergeinfo and how that can cause similar issues and that this was particularly problematic when users were using tortise.  We have had a few tortise users come and go on the project, so this could be the root cause of the problem - still need a fix though.</p>
  
  <p>Has anyone encountered a similar issue and determined a root cause and a fix.  Much appreciation.</p>