[xmonad] Wrong desktop on session restore

[Yitzchak Gale]

I wrote:
>> I don't think xmonad needs to support that - it doesn't
>> need to save or restore state. KDE does that part.

Brandon S. Allbery KF8NH wrote:
>  Actually it does --- KDE can only save and restore state if the client
> understands the WM_SAVE_YOURSELF protocol and posts a WM_COMMAND in
> response.

I was thinking of apps that do understand session management.
But yes, we should also be able to do a simple re-open for apps that don't,
with correctly restored geometry. KWin does that.

-Yitz