bug fix for KDevelop 2.1 beta 2

[Adam Dingle]

In KDevelop 2.1 beta 2, if I use the Edit/Search in Files command to search a 
large directory tree, then often KDevelop will fail to search the entire tree 
and some matches will be missed.  Here is a bug fix that solves this problem; 
please merge this into the KDevelop source tree if possible.  Thanks!

-adam
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