From c71ce6751172eb3b4752c6b48d087a844a36f8e4 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 12 Dec 2004 19:00:42 +0000
Subject: [PATCH] fixed Union() for the case of this rectangle being empty

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30966 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/common/gdicmn.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/common/gdicmn.cpp b/src/common/gdicmn.cpp
index 6cbe1a5d9e..0f73fff839 100644
--- a/src/common/gdicmn.cpp
+++ b/src/common/gdicmn.cpp
@@ -138,8 +138,13 @@ wxRect wxRect::operator+(const wxRect& rect) const
 
 wxRect& wxRect::Union(const wxRect& rect)
 {
-    // ignore empty rectangles
-    if ( rect.width && rect.height )
+    // ignore empty rectangles: union with an empty rectangle shouldn't extend
+    // this one to (0, 0)
+    if ( !width || !height )
+    {
+        *this = rect;
+    }
+    else if ( rect.width && rect.height )
     {
         int x1 = wxMin(x, rect.x);
         int y1 = wxMin(y, rect.y);
@@ -151,6 +156,7 @@ wxRect& wxRect::Union(const wxRect& rect)
         width = x2 - x1;
         height = y2 - y1;
     }
+    //else: we're not empty and rect is empty
 
     return *this;
 }
-- 
2.50.0