#981 UI locked

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UI lock down got me today:
I just break into debugger and noticed it just waits for the LuceneIndexModifiers thread.
There is a main loop with a one minute thread.sleep() call, the UI task (I added a new
feed and the feedhandler just want to add the newly retrieved items to the index via
indexModifier.AddRange()) blocked on the lock(this.pendingIndexOperations.SyncRoot)
and the IDE /CLR 2.0 displayed: "Thread is in sleep/wait or join mode".
It seems somehow the one minute sleep call seems to also block the pending index
operation queue modifications. Also there is a second lock variable (SyncRoot) that
may interfere with the other.

This issue may be releated to the other high CPU usage bug reports.


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