User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.8) Gecko/20071113 Firefox/2.0.0.8
Build Identifier: 

In certain situations, dragging an icon to or from the Desktop copies the file rather than moving it. For example: when I drag a file icon into a folder on the desktop, xfdesktop copies the file into the folder but leaves the original on the desktop. Likewise, when I drag a file from a thunar window to the desktop, the file gets copied to the desktop, but the original file remains. Needless to say, this breaks the standard icon-as-single-file idiom. 

Obviously this only applies when xfdesktop is in "show file/launcher icons" mode. 

Reproducible: Always

Steps to Reproduce:
1. Open $HOME in thunar and drag a file from the thunar window to the desktop. 
2. Create a folder on the desktop and drag the file from the desktop to the new folder.
3. There will now be three copies of the file. 

Sometimes dragging a desktop file into a thunar window also leaves a copy behind, but this second related bug is not always repeatable. 

Actual Results:  
Three copies of the file are created, one in the original folder, one on the desktop, and one in the new folder. 

Expected Results:  
Only one copy of the file should have existed, and it should have been moved from $HOME to $HOME/Desktop and then to $HOME/Desktop/New Folder.