Open File Requester damages underlaying windows when moved

[deadwood2]

"Basically if you do "Open File" the request file if moved produces many copies of the window, if the request remains open the windows on Wanderer will also have the same problem, see screenshot.

Tested this Problem on OWB, Zune Paint, Zune Fig and probably also found it on many other applications using Zune."

https://ae.amigalife.org/index.php?topic=909.60msg10680#msg10680