Add mocks for element scrolling methods

[just-boris]

Element prototype has several methods to scroll it, but those methods are commented in the sources.

Why did you do this? For example window.scrollTo is a function that does nothing, just prints warning in console. I think that it would be okay for Element.prototype.scroll() method as well.

[domenic]

PR welcome

[M3kH]

How far is this issue to be close?

[thenikso]

I also needed this, I ended up doing something like this:

const el = dom.window.document.querySelector(
    '.myScrollingElement',
  );
el.scrollTop = 12345;
el.dispatchEvent(new dom.window.Event('scroll'));

[jordantomax]

This affecting me to. I've tried many variations of overriding it, such as:

Object.defineProperty(window.Element.prototype, 'scrollIntoView', {
  writable: true,
  value: jest.fn()
})

But I either get an error that I can't override, or it does nothing. Am I doing something wrong?

[jessethomson]

I know this is old, but are you all still open to a PR to change this?

If scrollX, scrollY, etc are all hardcoded to 0, it seems like it makes sense that scroll, scrollBy, and scrollTo functions on the window object are just stubs. Let me know!

#2626

[domenic]

We need to tackle this problem comprehensively. Let's roll discussions into #2751.