[Bug 13823] New: Bad region repaint

http://bugs.winehq.org/show_bug.cgi?id=13823

Summary: Bad region repaint
           Product: Wine
           Version: 1.0-rc4
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

I'm using an ERP client that works quite well with Wine 0.9.46. 
After that version something is changed and background windows does not
correctly redraws when you close the top one.
The app uses MDI windows, so all child windows are in the main frame window
context. If you close a top level child window the back one does not redraw
itself.
It seems that invalidate regions are changed after the 0.9.46 version(an
optimization?), resulting in a wrong paint area.
Thanks,
Simone Tregnago