[Bug 48233] New: In a 64-bit app, GetSyscolor(COLOR_BTNSHADOW) returns a darker value than on windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48233

            Bug ID: 48233
           Summary: In a 64-bit app, GetSyscolor(COLOR_BTNSHADOW) returns
                    a darker value than on windows
           Product: Wine
           Version: 3.6
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
          Assignee: wine-bugs at winehq.org
          Reporter: ryampolsky at yahoo.com
      Distribution: ---

Created attachment 65879
  --> https://bugs.winehq.org/attachment.cgi?id=65879
Screenshot, showing shadow drawn with GetSysColor(COLOR_BTNSHADOW)

I recently converted my 32-bit app to 64-bits, and when I run either the 32-bit
version or the 64-bit version under a wine64 WINEPREFIX, the only difference I
notice is the value returned by GetSyscolor(COLOR_BTNSHADOW).  On Windows in
both the WIN32 and WIN64 versions of my app, it returns 0xa0a0a0, but on
WINE64, it returns 0x4c4c4c.

On WINE, I'm using the Ubuntu Light theme.  With that theme in effect, on
WINE32, GetSysColor(COLOR_BTNSHADOW) returns 0xa5a9ad.  But on WINE64, both the
WIN32 and WIN64 versions get 0x4c4c4c.  So the shadow looks too dark.  Again,
the WIN32 exe gets the right color under WINE32, but the same wrong color as
the WIN64 exe under WINE64 - which is why I think it's a WINE64 bug and not my
app.

Everything else seems to look the same between WINE32 and WINE64.

The attached screenshot shows the About dialog from my app.  There's a 3D frame
around the logo at the top - BTNSHADOW on top and left, BTNHIGHLIGHT on bottom
and right.  The text below it shows that this is the X64 version of the app,
and prints out the value returned by GetSysColor(COLOR_BTNSHADOW).

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