From 2fce3630ab79422cdcbf2aec56b7f059309c00cf Mon Sep 17 00:00:00 2001
From: James Tabor <james.tabor@reactos.org>
Date: Fri, 4 Apr 2014 14:40:51 +0000
Subject: [PATCH] [User32] - Patch by Javier Cantero : Fix side effect in
 SubtractRect(). - Sync port from wine with modifications

svn path=/trunk/; revision=62609
---
 reactos/win32ss/user/user32/windows/rect.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/reactos/win32ss/user/user32/windows/rect.c b/reactos/win32ss/user/user32/windows/rect.c
index 451407c3eb6..7ca28fbe227 100644
--- a/reactos/win32ss/user/user32/windows/rect.c
+++ b/reactos/win32ss/user/user32/windows/rect.c
@@ -193,16 +193,20 @@ SubtractRect(LPRECT lprcDst,
     if(lprcDst == NULL || lprcSrc1 == NULL || lprcSrc2 == NULL)
         return(FALSE);
 
-    CopyRect(lprcDst, lprcSrc1);
-
     if(!IntersectRect(&tempRect, lprcSrc1, lprcSrc2))
+    {
+        *lprcDst = *lprcSrc1;
         return(TRUE);
+    }
 
-    if (EqualRect(&tempRect, lprcDst))
+    if (EqualRect(&tempRect, lprcSrc1))
     {
         SetRectEmpty(lprcDst);
         return FALSE;
     }
+
+    *lprcDst = *lprcSrc1;
+
     if(lprcDst->top == tempRect.top && lprcDst->bottom == tempRect.bottom)
     {
         if(lprcDst->left == tempRect.left)