src/vs/editor/contrib/folding/browser/folding.ts/UnFoldRecursivelyAction/invoke
class UnFoldRecursivelyAction:	invoke(_foldingController: FoldingController, foldingModel: FoldingModel, editor: ICodeEditor, _args: any): void {
		setCollapseStateLevelsDown(foldingModel, false, Number.MAX_VALUE, this.getSelectedLines(editor));
	}