message: Fix ColorScheme::GetBlendedOn after wx update
diff: @@ -247,13 +247,17 @@ wxColour ColorScheme::GetBlendedOn(Color color, wxWindow *win)
  {
  auto bg = win->GetBackgroundColour();
  auto fg = Get(color, win);
  - if (fg.Alpha() == wxALPHA_OPAQUE)
  - return fg;
  +#ifndef __WXOSX__
  + if (fg.Alpha() != wxALPHA_OPAQUE)
  + {
  double alpha = fg.Alpha() / 255.0;
  return wxColour(wxColour::AlphaBlend(fg.Red(), bg.Red(), alpha),
  wxColour::AlphaBlend(fg.Green(), bg.Green(), alpha),
  wxColour::AlphaBlend(fg.Blue(), bg.Blue(), alpha));
  }
  +#endif
  + return fg;
  +}
  void ColorScheme::CleanUp()
  {
  