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    Bug 
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    Resolution: Done
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    P2: Important 
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    Qt Creator 2.2.0, Qt Creator 2.3.0, Qt Creator 2.4.0
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    Windows Vista x64
Set up an external tool which will generate a lot of output, e.g. print some megabytes of text. Then run this.
While the tool is running, Creator's UI will be unresponsive.