XFCE wm deadlocks on (other) console logout

[Zenaan Harkness <zenaan@freedbms.net>]

I consistently get a deadlock of the XFCE window manager, immediately
after I logout of say Linux console 2, when e.g. XFCE is running on
console 1.

Procedure to replicate:

1. login to console 1

2. start xfce

3. switch to console 2 (e.g. CTRL+ALT+F2)

4. loging to console 2

5. logout of console 2 (e.g. CTRL+D)


Notably, when I'm on console 2, either logged in or not, I can safely
use ALT+Left to go to console 1 and appears my XFCE desktop.

Similarly using Ctrl+Alt+F1

So I'm guessing some sort of unhandled race condition, but I'm at a
loss as to how to debug this.