Make wxTransientPopupWindow ignore button down events

which have been sent before or at the same time as
    the control creation time so that these evens don't
    make the control disappear again.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37747 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/popupwin.h

@@ -35,6 +35,9 @@ public:
     // --------------
 
     virtual void OnInternalIdle();
+    
+    // GTK time when connecting to button_press signal
+    wxUint32  m_time;
 
 
 protected: