• When using an OverscrollIndicator, have the corresponding ScrollBehavior actually clamp at min/max offset. Using an OverscrollIndicator doesn't let you reverse direction immediately #5226
• When the ScrollBehavior has clamped, it should fire an "overscroll" notification saying by how much more it would have scrolled if it hadn't in fact clamped.
• OverscrollIndicator should use that to grow itself / darken itself. OverscrollIndicator doesn't get darker as you get higher #5274 OverscrollIndicator doesn't flatten out when it goes away (it scrolls away instead) #5275
• OverscrollIndicator should drive all its animations of its own animation controller, not the scroll offset. OverscrollIndicator grows suddenly #5279
• OverscrollIndicator should paint based on the scroll offset, though. OverscrollIndicator doesn't paint at the bottom of the contents (it paints at the bottom of the container) #5276
• ScrollBehavior doesn't need to be parameterised. It is always one dimensional and always uses doubles. ScrollBehavior doesn't need to be parameterised. It is always one dimensional and always uses doubles. #6092

This doesn't help #5277.