Navigate to the shopping sub app in the new flutter gallery and take a frame capture. Notice that we're taking a loooong time ~18ms on the iPad to render the frame. Then look into the draw calls, and notice that we're painting the previous route too!

EDIT: This is due to gallery using a Positioned Widget instead of a Route.

Unclear what the problem is here. Are we missing a clip herustic? Or is this something that could be elimated by better ordering of paint commands