iPad Drag nad Drop does nor work correctly after window scrolling (no(no right position) onEnter/Leave/Drop events on dropController registered on pickupdragcontroller)

Does the issue occur in "quirks mode", "standards mode" or both? If you
don't know, does your HTML page contains a DOCTYPE declaration?
<!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

What version of GWT are you using? 
2.4.0

What version of the gwt-dnd jar file or library file are you using?
gwt-dnd-3.1.2.jar

What operating system(s) are you using? Windows? Linux? Mac?
All, but problem is on iPad (simulator of it, too).

Does the issue occur in web mode, development mode (formerly "hosted
mode"), both or don't know?
Web mode, there is no DevMode plugin for ipad, yet.

What browser(s) do you use? Chrome, Firefox, IE, Safari, other?
Safari mobile on iPad.

What is the browser version (if you know) from Help->About?
5.0.1

What steps will reproduce the problem? Please attach sample code if you
can.
1. drag and drop works correctly as long the view of the browser was not scolled
2. after scrolling the onEnter/Leafe/Drop event are not fired correctly
3. see your dnd-demo "BinExample": 
http://allen-sauer.com/com.allen_sauer.gwt.dnd.demo.DragDropDemo/DragDropDemo.ht
ml#BinExample
After scrolling the mouse over, over the bins is not working correctly anymore

What is the expected output? What do you see instead?
correct events. no or translated event positions.

Do you have a workaround?
no.

Please provide any additional information below.

Original issue reported on code.google.com by medion...@coolgoose.com on 4 Nov 2011 at 8:40

fredsa / gwt-dnd

iPad Drag nad Drop does nor work correctly after window scrolling (no(no right position) onEnter/Leave/Drop events on dropController registered on pickupdragcontroller) #152