public void Close(IToolWindowContent content)
        {
            if (content == null)
            {
                throw new ArgumentNullException(nameof(content));
            }
            var impl = GetTabContentImpl(content);

            Debug.Assert(impl != null);
            if (impl == null)
            {
                return;
            }
            TabGroup.Close(impl);
        }
 public void Close(TabContentImpl impl) => TabGroup.Close(impl);