I'm using the 4.2.1 version of xffm from the ubuntu-repos. Drag and dropping
attachments to Thunderbird does not work. It works, however, from nautilus and
rox. I talked to the folkes on freenode and they suggested filing this bug,
which i hereby do.

Reproducible: Always
Steps to Reproduce:
1. start xffm
2. start thunderbird
3. open a new message window
4. drag a file from xffm to the new message window to the place where the
attachments usually go

Actual Results:  
nothing

Expected Results:  
thunderbird should be engaged to load that file as an attachment