How to see deleted elements?

In Potlach 1 using Ctrl+U was possible to see deleted elements, any idea how to do it now?

As of today, there is no other tool do easily display deleted OSM elements.

We still have an issue about that in the OSM wiki:

Using Potlach 1 still works. There is of course a JOSM plugin too. See the similar topic I started a couple of days ago.