In D13274#273076, @hein wrote:

This is not what the patch you like actually did. That patch disallowed dropping things outside the panel when it's locked, but it still, of course, allowed dragging them outside of the panel. It's basically the same as this, except that you need to unlock the panel to drop things on the desktop. I find that unnecessarily complicated and this works better.

Oops, my mistake. I guess that's what I wished it did! Either way, thanks for this. Should make folks happy.