src/vs/base/browser/ui/splitview/paneview.ts/PaneView/setupAnimation
class PaneView:	private setupAnimation(): void {
		if (typeof this.animationTimer === 'number') {
			window.clearTimeout(this.animationTimer);
		}

		this.element.classList.add('animated');

		this.animationTimer = window.setTimeout(() => {
			this.animationTimer = undefined;
			this.element.classList.remove('animated');
		}, 200);
	}