[Drawkit] funky zooming

[James Maxwell]

I just noticed this, but on my Macbook, running 10.5.4 the zooming is  
a bit funky. Zooming in is fine, but when I zoom out, it will actually  
continue zooming in if I zoom slowly. If I zoom quickly it zooms out  
as expected.
I thought I'd report this, as I haven't touched zooming at all.
My app is DKDrawingDocument-based and uses standard DKDrawingViews (no  
subclassing).

J.