src/vs/base/browser/ui/scrollbar/scrollbarVisibilityController.ts/ScrollbarVisibilityController/setDomNode
class ScrollbarVisibilityController:	public setDomNode(domNode: FastDomNode<HTMLElement>): void {
		this._domNode = domNode;
		this._domNode.setClassName(this._invisibleClassName);

		// Now that the flags & the dom node are in a consistent state, ensure the Hidden/Visible configuration
		this.setShouldBeVisible(false);
	}