content clipping becomes a runtime attribute

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33210 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/window.cpp

@@ -748,6 +748,7 @@ void wxWindowMac::Init()
 #if wxMAC_USE_CORE_GRAPHICS
     m_cgContextRef = NULL ;
 #endif
+    m_clipChildren = false ;
     // we need a valid font for the encodings
     wxWindowBase::SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 }