src/vs/workbench/browser/actions/workspaceActions.ts/AddRootFolderAction/constructor
class AddRootFolderAction:	constructor() {
		super({
			id: AddRootFolderAction.ID,
			title: ADD_ROOT_FOLDER_LABEL,
			category: workspacesCategory,
			f1: true,
			precondition: ContextKeyExpr.or(EnterMultiRootWorkspaceSupportContext, WorkbenchStateContext.isEqualTo('workspace'))
		});
	}