From cdbe644f77e405fb05ad48b543ec59c95cd4b51c Mon Sep 17 00:00:00 2001
From: Slava Monich <Slava_Monich@cnt.com>
Date: Sat, 8 Jul 2000 12:44:09 +0000
Subject: [PATCH] BeginDeferWindowPos should allow zero count.

---
 windows/winpos.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/windows/winpos.c b/windows/winpos.c
index b4264cdd22d..45b335f062e 100644
--- a/windows/winpos.c
+++ b/windows/winpos.c
@@ -8,6 +8,7 @@
 #include <string.h>
 #include "windef.h"
 #include "wingdi.h"
+#include "winerror.h"
 #include "wine/winuser16.h"
 #include "heap.h"
 #include "module.h"
@@ -2929,7 +2930,14 @@ HDWP WINAPI BeginDeferWindowPos( INT count )
     HDWP handle;
     DWP *pDWP;
 
-    if (count <= 0) return 0;
+    if (count < 0) 
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return 0;
+    }
+    /* Windows allows zero count, in which case it allocates context for 8 moves */
+    if (count == 0) count = 8;
+
     handle = USER_HEAP_ALLOC( sizeof(DWP) + (count-1)*sizeof(WINDOWPOS) );
     if (!handle) return 0;
     pDWP = (DWP *) USER_HEAP_LIN_ADDR( handle );
-- 
2.11.4.GIT