__computeScrollMax computes wrong values about scroller

[niieani]

Actually, this seems quite odd, but the logic works differently in different examples.
For example when scaling the context of the canvas (ctx.scale) my logic works, but when redrawing the components like you do in the canvas example your logic works.
Maybe there should be a way to override the default logic in case of a different implementation of the rendering?

[swernerx]

It mainly depends on whether your properties apply zooming on top of dimensions or the other way around. This is the reason why we recompute the dimensions and positions based on zooming in some examples and do not so in others.