src/vs/workbench/browser/parts/panel/panelPart.ts/PanelPart/cachedPanelsValue
class PanelPart:	private set cachedPanelsValue(cachedViewletsValue: string) {
		if (this.cachedPanelsValue !== cachedViewletsValue) {
			this._cachedPanelsValue = cachedViewletsValue;
			this.setStoredCachedViewletsValue(cachedViewletsValue);
		}
	}