[Bug 44392] BM_SETIMAGE sets image with white background instead of transparent

https://bugs.winehq.org/show_bug.cgi?id=44392

--- Comment #6 from [e-mail] ---
The full file (vs2005):

#define UNICODE
#define _WIN32_IE 0x0600
#define _WIN32_WINNT 0x0501

#include <windows.h>
#include <gdiplus.h>
#include <Commctrl.h>

#pragma comment(lib,"gdiplus.lib")
#pragma comment(lib,"gdi32.lib")
#pragma comment(lib,"user32.lib") 
#pragma comment(lib,"comctl32.lib")

#pragma comment(linker,"/manifestdependency:"type='win32'
name='Microsoft.Windows.Common-Controls' ""version='6.0.0.0'
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'"")

HBITMAP loadBitmap(const wchar_t* path)
{
   HBITMAP tBmp = NULL;
   ULONG_PTR token = 0;
   Gdiplus::GdiplusStartupInput input = NULL;
   Gdiplus::GdiplusStartup(&token, &input, NULL);
   if (token != 0)
   {
      Gdiplus::Bitmap* bmp = new Gdiplus::Bitmap(path);
      bmp->GetHBITMAP(Gdiplus::Color::Transparent, &tBmp);
      delete bmp;
      Gdiplus::GdiplusShutdown(token);
   }
   return tBmp;
}

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM
lParam)
{
   static HBITMAP tBmp = NULL;
   switch (message)
   {
   case WM_CREATE:
   {
      HWND btn = CreateWindow(L"BUTTON", L"TEXT", BS_BITMAP  | WS_VISIBLE |
WS_CHILD | BS_DEFPUSHBUTTON,
         100, 100, 95, 25, hwnd, (HMENU)1, NULL, NULL);
      tBmp =
loadBitmap(L"C:\sourcecode\llib\include\llib\resources\images\zoomin_disabled.png");
      SendMessage(btn, BM_SETIMAGE, IMAGE_BITMAP, (LPARAM)tBmp);
      ShowWindow(btn, SW_SHOW);
   }
   break;

case WM_DESTROY:
      DeleteObject(tBmp);
      PostQuitMessage(0);
      break;
   default:
      return DefWindowProc(hwnd, message, wParam, lParam);
   }
   return 0;
}

void SetImageBug(HINSTANCE hInstance)
{
   MSG  msg;
   WNDCLASS wc = { 0 };
   wc.lpszClassName = TEXT("EU");
   wc.hInstance = hInstance;
   wc.hbrBackground = (HBRUSH)COLOR_BACKGROUND;
   wc.lpfnWndProc = WindowProcedure;
   wc.hCursor = LoadCursor(0, IDC_ARROW);
   wc.hIcon = NULL;

RegisterClass(&wc);
   CreateWindow(wc.lpszClassName, TEXT("Test png loading"),
      WS_VISIBLE | WS_CAPTION | WS_SYSMENU ,
      (GetSystemMetrics(SM_CXSCREEN) - 230) / 2, (GetSystemMetrics(SM_CYSCREEN)
- 100) / 2, 280 + 10, 110 + 20 + 190, 0, 0, hInstance, 0);

while (GetMessage(&msg, NULL, 0, 0)) {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
   exit(0);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
{
   INITCOMMONCONTROLSEX x;
   x.dwSize = sizeof(x);
   x.dwICC = ICC_STANDARD_CLASSES;
   if(!InitCommonControlsEx(&x)) return 0;

SetImageBug(hInstance);
}