Fix race in ANIMATE_WindowProc

[Francois Gouget <fgouget@xxxxxxxxxxxxxxx>]

Changelog:

   Francois Gouget <fgouget@xxxxxxxxxxxxxxx>

 * dlls/comctl32/animate.c

   Fix a race that caused the Microsoft Viewers 'file extraction' 
animation to sometimes have a pink background.

--
Francois Gouget
fgouget@xxxxxxxxxxxxxxx

Index: dlls/comctl32/animate.c
===================================================================
RCS file: /home/cvs/wine/dlls/comctl32/animate.c,v
retrieving revision 1.52
diff -u -r1.52 animate.c
--- dlls/comctl32/animate.c	20 Nov 2003 22:04:14 -0000	1.52
+++ dlls/comctl32/animate.c	12 Jan 2004 18:23:07 -0000
@@ -899,10 +899,15 @@
         {
             ANIMATE_INFO* infoPtr = ANIMATE_GetInfoPtr(hWnd);
 
-            /* the animation isn't playing, don't paint */
-	    if(!infoPtr->uTimer && !infoPtr->hThread)
-		/* default paint handling */
-	    	return DefWindowProcA(hWnd, uMsg, wParam, lParam);
+            /* the animation isn't playing, or has not decompressed
+             * (and displayed) the first frame yet, don't paint
+             */
+            if ((!infoPtr->uTimer && !infoPtr->hThread) ||
+                !infoPtr->hbmPrevFrame)
+            {
+                /* default paint handling */
+                return DefWindowProcA(hWnd, uMsg, wParam, lParam);
+            }
 
             if (GetWindowLongA(hWnd, GWL_STYLE) & ACS_TRANSPARENT)
                 infoPtr->hbrushBG = (HBRUSH)SendMessageA(infoPtr->hwndNotify,