winex11: Get rid of the client-side DIB optimization in AlphaBlend.

dlls/winex11.drv/xrender.c

@@ -2876,18 +2876,8 @@ static BOOL xrenderdrv_AlphaBlend( PHYSDEV dst_dev, struct bitblt_coords *dst,
         return FALSE;
     }
 
-    if (physdev_dst != physdev_src)
-    {
-        int status = X11DRV_LockDIBSection( physdev_src->x11dev, DIB_Status_None );
-        if (status == DIB_Status_AppMod || status == DIB_Status_InSync)
-        {
-            X11DRV_UnlockDIBSection( physdev_src->x11dev, FALSE );
-            dst_dev = GET_NEXT_PHYSDEV( dst_dev, pAlphaBlend );
-            return dst_dev->funcs->pAlphaBlend( dst_dev, dst, src_dev, src, blendfn );
-        }
-        X11DRV_CoerceDIBSection( physdev_src->x11dev, DIB_Status_GdiMod );
-    }
     X11DRV_LockDIBSection( physdev_dst->x11dev, DIB_Status_GdiMod );
+    if (physdev_dst != physdev_src) X11DRV_LockDIBSection( physdev_src->x11dev, DIB_Status_GdiMod );
 
     dst_pict = get_xrender_picture( physdev_dst, 0, &dst->visrect );