From c2a9b451ba582d0e83ef9ee653fb397ec8812154 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 20 Nov 2013 12:01:03 +0000
Subject: [PATCH] Fix wxRegion::Offset() copy on write behaviour in wxMSW.

Offset the correct, new and unshared, region handle instead of the old and
possibly shared one.

Closes #15690.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75249 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt   | 1 +
 src/msw/region.cpp | 5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index bdffb24eeb..4b6c1f2a5e 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -593,6 +593,7 @@ wxMSW:
 
 - Fix blank wxBitmapComboBox dropdown appearance.
 - Make "%lu" work with size_t arguments under Win64 (laro).
+- Fix wxRegion::Offset() with shared objects (Joost Nieuwenhuijse).
 
 
 3.0.0: (released 2013-11-11)
diff --git a/src/msw/region.cpp b/src/msw/region.cpp
index d8523a072f..846fff1e85 100644
--- a/src/msw/region.cpp
+++ b/src/msw/region.cpp
@@ -164,8 +164,7 @@ void wxRegion::Clear()
 
 bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 {
-    const HRGN hrgn = GetHrgn();
-    wxCHECK_MSG( hrgn, false, wxT("invalid wxRegion") );
+    wxCHECK_MSG( GetHrgn(), false, wxT("invalid wxRegion") );
 
     if ( !x && !y )
     {
@@ -175,7 +174,7 @@ bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 
     AllocExclusive();
 
-    if ( ::OffsetRgn(hrgn, x, y) == ERROR )
+    if ( ::OffsetRgn(GetHrgn(), x, y) == ERROR )
     {
         wxLogLastError(wxT("OffsetRgn"));