#8 Hotkey to jump to "previsously used desktop"

[Martin Egholm]

With the use I have, I often need to jump between two
desktops - not necessarily the same two. So I would
like to be able to configure a hotkey to "jump back the
desktop I was on before I got here". Doing it twice,
will then make VD jump back again:

D_X -> D_Y
hotkey -> D_X
hotkey -> D_Y
D_Y -> D_Z
hotkey -> D_Y
hotkey -> D_Z
...