how to get "scrollingContainer" in 2.x?

[yzllee]

I have used "scrollingContainer" to do a lot of things in 1.x, but I can't get "scrollingContainer" in 2.x, so how can I get it?

eg:

const SCROLLTOP = this.quill.scrollingContainer.scrollTop;
const scrollingContainerHeight = this.quill.scrollingContainer.clientHeight;