I found this in fedora-15; If someone could verify it for me that would be great.

Pre-conditions:
1) F15 installed and fully updated as of today
2) Used gnome-tweak-tool; All File manager options are ON except Network Servers icon visible on the desktop.
3) Trash is full
4) I have 2 22" monitors connected to my box, if that makes a difference.

Steps to re-create:
1) Right-click on Trash

2) The confirmation dialog box pops up. (in the middle; divided between both screens)
Empty all items from Trash?

3) Move this dialog box to one screen or the other. It doesn't matter. 

4) Bug: When moving the 'Empty Trash' dialog box, the Desktop icons, wallpaper, et al, move in tandem with this dialog box as as well.


Some details:
$ rpm -qa gnome-shell gnome-desktop3 gnome-tweak-tool
gnome-shell-3.0.2-4.fc15.x86_64
gnome-desktop3-3.0.1-2.fc15.x86_64
gnome-tweak-tool-3.0.5-2.fc15.noarch

$ sudo cat /etc/*release*
Fedora release 15 (Lovelock)
Fedora release 15 (Lovelock)
Fedora release 15 (Lovelock)
cpe:/o:fedoraproject:fedora:15

Let me know if you need more details.

TT