Oh well, it was more than a debug print after all...
Correct commit message would be
[OPENGL32]
  - Take PFD_DRAW_TO_WINDOW, PFD_SUPPORT_OPENGL and PFD_SUPPORT_GDI into
account in wglChoosePixelFormat
  - Add a debug print
Regards
Jérôme
Le 02/01/2014 09:46, jgardou(a)svn.reactos.org a écrit :
  Author: jgardou
 Date: Thu Jan  2 08:46:51 2014
 New Revision: 61487
 URL: 
http://svn.reactos.org/svn/reactos?rev=61487&view=rev
 Log:
 [OPENGL32]
   - Add a debug print.
 CORE-7727 #comment Please retest with debugging turned on on r61487
 Modified:
      trunk/reactos/dll/opengl/opengl32/wgl.c
 Modified: trunk/reactos/dll/opengl/opengl32/wgl.c
 URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/opengl/opengl32/wgl.c?…
 ==============================================================================
 --- trunk/reactos/dll/opengl/opengl32/wgl.c    [iso-8859-1] (original)
 +++ trunk/reactos/dll/opengl/opengl32/wgl.c    [iso-8859-1] Thu Jan  2 08:46:51 2014
 @@ -78,6 +78,7 @@
           data->nb_icd_formats = data->icd_data->DrvDescribePixelFormat(hdc, 0,
0, NULL);
       else
           data->nb_icd_formats = 0;
 +    TRACE("ICD %S has %u formats for HDC %x.\n",
data->icd_data->DriverName, data->nb_icd_formats, hdc);
       data->nb_sw_formats = sw_DescribePixelFormat(hdc, 0, 0, NULL);
       data->next = dc_data_list;
       dc_data_list = data;
 @@ -191,10 +192,31 @@
               continue;
           }
 -        /* only use bitmap capable for formats for bitmap rendering */
 -        if( (ppfd->dwFlags & PFD_DRAW_TO_BITMAP) != (format.dwFlags &
PFD_DRAW_TO_BITMAP))
 +        /* only use bitmap capable formats for bitmap rendering */
 +        if ((ppfd->dwFlags & PFD_DRAW_TO_BITMAP) != (format.dwFlags &
PFD_DRAW_TO_BITMAP))
           {
               TRACE( "PFD_DRAW_TO_BITMAP mismatch for iPixelFormat=%d\n", i );
 +            continue;
 +        }
 +
 +        /* only use window capable formats for window rendering */
 +        if ((ppfd->dwFlags & PFD_DRAW_TO_WINDOW) != (format.dwFlags &
PFD_DRAW_TO_WINDOW))
 +        {
 +            TRACE( "PFD_DRAW_TO_WINDOW mismatch for iPixelFormat=%d\n", i );
 +            continue;
 +        }
 +
 +        /* only use opengl capable formats for opengl rendering */
 +        if ((ppfd->dwFlags & PFD_SUPPORT_OPENGL) != (format.dwFlags &
PFD_SUPPORT_OPENGL))
 +        {
 +            TRACE( "PFD_SUPPORT_OPENGL mismatch for iPixelFormat=%d\n", i );
 +            continue;
 +        }
 +
 +        /* only use GDI capable formats for GDI rendering */
 +        if ((ppfd->dwFlags & PFD_SUPPORT_GDI) != (format.dwFlags &
PFD_SUPPORT_GDI))
 +        {
 +            TRACE( "PFD_SUPPORT_GDI mismatch for iPixelFormat=%d\n", i );
               continue;
           }