[Bug 1841] New: wrong region drawn

[Wine Bugs]

http://bugs.winehq.com/show_bug.cgi?id=1841

Summary: wrong region drawn
           Product: Wine
           Version: CVS
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: wine-gdi
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Dialog contains a bitmap.  On redrawing the wrong half of the bitmap gets 
redrawn; i.e. when exposing a region the area that was not exposed gets 
repainted rather than the region exposed.

(The actual case that demonstrates this is part of the ACCPAC installation 
program.)