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+1  Q: 

How can I scroll a XUL tree element by less than a whole row?

I've got a XUL tree element, and would like to scroll the rows up and down on a per-pixel basis, instead of by whole rows, if possible.

Browsing through the source to mozilla-central, and Thunderbird's copy at comm-central, it looks like I can only scroll by rows, but I guess I'm hoping that I missed something.

(The other option I saw was to wrap the whole tree in a scrollbox, but that would end up scrolling the headers, which I don't really want to do.)

Thanks, Blake.

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