workaround because regions that were built up, were sometimes being drawn on the screen as well...

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35234 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/region.cpp

@@ -89,6 +89,21 @@ wxRegion::wxRegion(size_t n, const wxPoint *points, int WXUNUSED(fillStyle))
 {
     m_refData = new wxRegionRefData;
 
+    // OS X somehow does not collect the region invisibly as before, so sometimes things
+    // get drawn on screen instead of just being combined into a region, therefore we allocate a temp gworld now
+    
+	GWorldPtr	gWorld = NULL;
+	GWorldPtr	oldWorld;
+	GDHandle	oldGDHandle;
+    OSStatus    err ;
+	Rect		destRect = {0,0,1,1};
+    
+    ::GetGWorld( &oldWorld, &oldGDHandle );
+    err = ::NewGWorld( &gWorld, 32, &destRect, nil, nil, 0 );
+    if ( err == noErr )
+    {
+        ::SetGWorld( gWorld, GetGDevice() );
+        
         OpenRgn();
 
         wxCoord x1, x2 , y1 , y2 ;
@@ -106,8 +121,9 @@ wxRegion::wxRegion(size_t n, const wxPoint *points, int WXUNUSED(fillStyle))
         {
             ::LineTo(x1,y1 ) ;
         }
-    ClosePoly();
         CloseRgn( M_REGION ) ;
+        ::SetGWorld( oldWorld, oldGDHandle );
+    }
 }
 
 /*!