src/vs/workbench/browser/parts/panel/panelPart.ts/PanelPart/setStoredPlaceholderViewContainersValue
class PanelPart:	private setStoredPlaceholderViewContainersValue(value: string): void {
		this.storageService.store(PanelPart.PLACEHOLDER_VIEW_CONTAINERS, value, StorageScope.WORKSPACE, StorageTarget.MACHINE);
	}