Description of problem:
Document list search is returning incorrect results when doing multiple continuous searches.

Version-Release number of selected component (if applicable):
2.1-SNAPSHOT

How reproducible:
Always

Steps to Reproduce:
1. Go to the document list on a Project with multiple documents and where its documents reside under directories.
2. Make sure the "Exact Match" checkbox is not checked.
3. Do a search for a partial word contained in the name or directory of a file.
4. Make sure the above search returns results.
5. Change the search term and hit Enter to search again.
  
Actual results:
The returned results include some files that should not be there. From my tests it includes documents that were initially returned in the first search (Steps 1-3)

Expected results:
The search results on step 5 should only return documents that contain the search term in the text entry.


Additional info: