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W2K, jdk 1.4.2_04 See the screenshot. Selecting the item just above the empty space and pushing down-arrow key moves the selection to the item just below the empty space. So the empty space is really empty space. And note that there is no wild white-space in the source code between the items above and below the empty space in the tree.
Created attachment 16448 [details] Screenshot
Can you reproduce it? Does it happen often? Or it just happened once. It looks like a Swing bug...
I saw it only once.
If it happens again, please raise priority.
Did not happen again