Modal dialogs should not be shown via ShowWindow until the message

dlls/user/tests/dialog.c

@@ -761,10 +761,10 @@ static void InitialFocusTest (void)
     ok (((g_styleInitialFocusT1 & WS_TABSTOP) == 0),
        "Error in wrc - Detected WS_TABSTOP as default style for GROUPBOX\n");
 
-    todo_wine ok (((g_styleInitialFocusT2 & WS_VISIBLE) == 0),
+    ok (((g_styleInitialFocusT2 & WS_VISIBLE) == 0),
        "Modal dialogs should not be shown until the message queue first goes empty\n");
 
-    todo_wine ok ((g_hwndInitialFocusT1 == NULL),
+    ok ((g_hwndInitialFocusT1 == NULL),
         "Error in initial focus when WM_INITDIALOG returned FALSE: "
         "Expected NULL focus, got %s (%p).\n",
         GetHwndString(g_hwndInitialFocusT1), g_hwndInitialFocusT1);

windows/dialog.c

@@ -765,24 +765,30 @@ INT DIALOG_DoDialogBox( HWND hwnd, HWND owner )
     MSG msg;
     INT retval;
     HWND ownerMsg = GetAncestor( owner, GA_ROOT );
+    BOOL bFirstEmpty;
 
     if (!(dlgInfo = DIALOG_get_info( hwnd, FALSE ))) return -1;
 
+    bFirstEmpty = TRUE;
     if (!(dlgInfo->flags & DF_END)) /* was EndDialog called in WM_INITDIALOG ? */
     {
-        ShowWindow( hwnd, SW_SHOW );
         for (;;)
         {
-            if (!(GetWindowLongW( hwnd, GWL_STYLE ) & DS_NOIDLEMSG))
-            {
             if (!PeekMessageW( &msg, 0, 0, 0, PM_REMOVE ))
             {
+                if (bFirstEmpty)
+                {
+                    /* ShowWindow the first time the queue goes empty */
+                    ShowWindow( hwnd, SW_SHOWNORMAL );
+                    bFirstEmpty = FALSE;
+                }
+                if (!(GetWindowLongW( hwnd, GWL_STYLE ) & DS_NOIDLEMSG))
+               {
                     /* No message present -> send ENTERIDLE and wait */
                     SendMessageW( ownerMsg, WM_ENTERIDLE, MSGF_DIALOGBOX, (LPARAM)hwnd );
-                    if (!GetMessageW( &msg, 0, 0, 0 )) break;
                 }
+                if (!GetMessageW( &msg, 0, 0, 0 )) break;
             }
-            else if (!GetMessageW( &msg, 0, 0, 0 )) break;
 
             if (!IsWindow( hwnd )) return -1;
             if (!(dlgInfo->flags & DF_END) && !IsDialogMessageW( hwnd, &msg))