[COMCTL] Fix propsheet flickering

[Felix Nawothnig]

This fixes some annoying flicker in winecfg...

ChangeLog:
Don't invalidate the whole propsheet when the page is switched.
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Index: propsheet.c
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RCS file: /home/wine/wine/dlls/comctl32/propsheet.c,v
retrieving revision 1.129
diff -u -p -r1.129 propsheet.c
--- propsheet.c	5 Jul 2005 10:57:37 -0000	1.129
+++ propsheet.c	5 Jul 2005 19:00:40 -0000
@@ -1603,6 +1603,7 @@ static BOOL PROPSHEET_ShowPage(HWND hwnd
      ShowWindow(psInfo->proppage[psInfo->active_page].hwndPage, SW_HIDE);
 
   ShowWindow(psInfo->proppage[index].hwndPage, SW_SHOW);
+  UpdateWindow(psInfo->proppage[index].hwndPage);
 
   /* Synchronize current selection with tab control
    * It seems to be needed even in case of PSH_WIZARD (no tab controls there) */
@@ -1623,9 +1624,6 @@ static BOOL PROPSHEET_ShowPage(HWND hwnd
 	  ShowWindow(hwndLineHeader, SW_SHOW);
   }
 
-  InvalidateRgn(hwndDlg, NULL, TRUE);
-  UpdateWindow(hwndDlg);
-
   return TRUE;
 }