[Bug 45807] New: Incorrect toolbar background in MFC apps, when visual theming enabled

https://bugs.winehq.org/show_bug.cgi?id=45807

Bug ID: 45807
           Summary: Incorrect toolbar background in MFC apps, when visual
                    theming enabled
           Product: Wine
           Version: 3.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 62266
  --> https://bugs.winehq.org/attachment.cgi?id=62266
Screenshot of bug

When visual theming is enabled, MFC toolbar button backgrounds are rendered as
"grab handles", and space between buttons is black.

(Also visible in screenshot, in 0CC and j0CC, the instrument editor piano is
invisible when theming is enabled. Should I file a separate bug?)

Tested with ReactOS.iso Lautus theme, and Zune theme (via .msi). Tested with
j0CC-Famitracker and OpenMPT (both use MFC), on dirty WINEPREFIX.

Also tested with Lautus and j0CC on clean WINEPREFIX with Lautus theme.