I'd like to disable DnD in my GWT app unless I specifically allow it (which 
I do in places).  Is there a way to detect and optionally prevent drops 
globally (prevent page unloads in this case)?

My use case is that we do support DnD in certain ways but if they drop 
wrong it causes the entire page to unload and then when they select the 
back browser button...the app will come back but they have to login again 
and reinitialize the app.

I thought of just adding a global Window.ClosingHandler() handler but that 
doesn't work because...there are lots of valid reasons the page is 
unloading and our security filters have already processed the logout...so 
that's too late...I think I need to detect that they did a drop, possibly 
by accident, and allow them to cancel the drop.

-Dave 

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