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