src/vs/workbench/browser/parts/panel/panelPart.ts/BasePanelPart/getStoredPlaceholderViewContainersValue
class BasePanelPart:	private getStoredPlaceholderViewContainersValue(): string {
		return this.storageService.get(this.placeholdeViewContainersKey, StorageScope.WORKSPACE, '[]');
	}