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.
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