src/vs/editor/contrib/hover/browser/contentHover.ts/ContentHoverWidget/_setVisibleData
class ContentHoverWidget:	private _setVisibleData(visibleData: ContentHoverVisibleData | null): void {
		if (this._visibleData) {
			this._visibleData.disposables.dispose();
		}
		this._visibleData = visibleData;
		this._hoverVisibleKey.set(!!this._visibleData);
		this._hover.containerDomNode.classList.toggle('hidden', !this._visibleData);
	}