The up and down arrow keys work fine in those boxes, but they only work after the completion popup is triggerred, that is after you type at least one character, you can type and then delete that character to use the arrow keys on the complete list.
I suppose one could have the up/down arrow keys popup the completion list even without anything typed, but that maybe somewhat painful to do because of the way the completion popup works (its a custom non-Qt one for various reasons). Need to look at it in more detail sometime.
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