[Bug 23142] New: garbage icons in Wine's programs

http://bugs.winehq.org/show_bug.cgi?id=23142

Summary: garbage icons in Wine's programs
           Product: Wine
           Version: 1.2-rc1
          Platform: x86
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

commit ea596f8a5f7d732bb56b5921ceb964137df0b930
Author: Alexandre Julliard 
Date:   Tue May 18 14:11:51 2010 +0200
    winex11: Force alpha channel to 0 when blitting to depth 32 from a lower
depth.

causes garbage to be displayed instead of the icons in
- winecfg's audio tab: the checkbox (the +/- signs are ok)
- "wine control": the software control panel icon.

I filed a new issue even though bug #22958 is about the same commit, because
this is Mac(/NVidia?)-specific, does not depend on other SW, nor gdiplus. Ouch,
another instance where fixing a bug #22457 causes a new one.

Using wine-1.1.rc3 on an "early 2009" Mac Mini with NVidia 9400GM on MacOS X
.5.8.
There's no such effect on Ubuntu Intrepid with Intel graphics HW.