src/vs/workbench/browser/parts/panel/panelPart.ts/BasePanelPart/cachedPanelsValue
class BasePanelPart:	private get cachedPanelsValue(): string {
		if (!this._cachedPanelsValue) {
			this._cachedPanelsValue = this.getStoredCachedPanelsValue();
		}

		return this._cachedPanelsValue;
	}