ScrollView: Call update() from scrollTop.postSet, not on scroll.
ScrollView: Call update() from scrollTop.postSet, not on scroll.

Now updates as you drag the scrollbar, not just on proper scrolls.

jlhughes/foam,foam-framework/foam,jacksonic/foam,jlhughes/foam,jacksonic/foam,jlhughes/foam,osric-the-knight/foam,osric-the-knight/foam,jlhughes/foam,jacksonic/foam,foam-framework/foam,mdittmer/foam,foam-framework/foam,mdittmer/foam,jacksonic/foam,osric-the-knight/foam,osric-the-knight/foam,mdittmer/foam,foam-framework/foam,foam-framework/foam,mdittmer/foam