⌥⇧C or ⌥⇧C⌥⇧C or ⌥⇧C⇧ ⌥ C, ⌥⇧C or ⌥⇧C⇧ ⌥ C, ⌥⇧C or ⌥⇧C
In the Recent Changes popup, use the arrow keys to move in the list, and the ⏎ or ⏎⏎ or ⏎⏎ or ⏎Enter, ⏎ or ⏎Enter, ^ M, ⏎, ⌃M, ⏎ or ⌃M key to see details and, if necessary, to revert to the previous state.