Can't drag icons to inactive if all icons are in active

Issue Summary

Hi,

I was playing with the module settings and in a profile I added all available icons to active. Once I did this I couldn't drag them back into inactive. It was not that I couldn't drag and drop, everything was fine, no javascript errors but when dragging them down, the icons couldn't find the area to dock to if you understand what I mean :) I had to delete the profile and re-create it to continue.

No biggy as probably no one ever does this but thought I'd mention :)

Cheers