Re: E_FAIL error in case of drag-and-drop aborting
No. I noticed this problem when return value assert was triggered in my app.
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E_FAIL error from IDropTarget::Drop handler when Abort selected from drag-and-drop menu. This error is returned to source app via DoDragDrop return value. According to docs, target app should return DRAGDROP_S_CANCEL when drag-and-drop was canceled, therefore IDropTarget::Drop result should be DRAGDROP_S_CANCEL.