src/vs/editor/common/viewLayout/viewLayout.ts/ViewLayout/deltaScrollNow
class ViewLayout:	public deltaScrollNow(deltaScrollLeft: number, deltaScrollTop: number): void {
		const currentScrollPosition = this._scrollable.getCurrentScrollPosition();
		this._scrollable.setScrollPositionNow({
			scrollLeft: currentScrollPosition.scrollLeft + deltaScrollLeft,
			scrollTop: currentScrollPosition.scrollTop + deltaScrollTop
		});
	}