reference count the GtkMenuItem in wxMenuItem as well

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/menu.cpp

@@ -597,9 +597,20 @@ wxMenuItem::wxMenuItem(wxMenu *parentMenu,
 
 wxMenuItem::~wxMenuItem()
 {
+    if (m_menuItem)
+        g_object_unref(m_menuItem);
    // don't delete menu items, the menus take care of that
 }
 
+void wxMenuItem::SetMenuItem(GtkWidget* menuItem)
+{
+    if (m_menuItem)
+        g_object_unref(m_menuItem);
+    m_menuItem = menuItem;
+    if (menuItem)
+        g_object_ref(menuItem);
+}
+
 void wxMenuItem::SetItemLabel( const wxString& str )
 {
 #if wxUSE_ACCEL