src/vs/base/browser/ui/splitview/splitview.ts/SplitView/updateScrollableElement
class SplitView:	private updateScrollableElement(): void {
		if (this.orientation === Orientation.VERTICAL) {
			this.scrollableElement.setScrollDimensions({
				height: this.size,
				scrollHeight: this.contentSize
			});
		} else {
			this.scrollableElement.setScrollDimensions({
				width: this.size,
				scrollWidth: this.contentSize
			});
		}
	}