src/vs/editor/contrib/find/browser/findWidget.ts/FindWidget/getViewState
class FindWidget:	getViewState() {
		let widgetViewZoneVisible = false;
		if (this._viewZone && this._viewZoneId) {
			widgetViewZoneVisible = this._viewZone.heightInPx > this._codeEditor.getScrollTop();
		}

		return {
			widgetViewZoneVisible,
			scrollTop: this._codeEditor.getScrollTop()
		};
	}