Don't infinitely recurse when setting the child focus. Without

this, nested panels/scrolled windows that work fine on wxGTK, wxMSW
can cause infinite recursion on wxMac


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26868 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/containr.h

@@ -92,6 +92,9 @@ protected:
     // a temporary override of m_winDefault, use the latter if NULL
     wxWindow *m_winTmpDefault;
 
+    // a guard against infinite recursion
+    bool m_inSetFocus;
+
     DECLARE_NO_COPY_CLASS(wxControlContainer)
 };