Gtk::Accelerator.to_name(key, mods)
Converts an accelerator keyval and modifier mask into a string
parseable by Gtk::Accelerator.parse. For example, if you pass in
Gdk::Keyval::GDK_q and Gdk::Keyval::GDK_CONTROL_MASK, this method
returns “q”.
we should read Gdk::CONTROL_MASK instead of
Gdk::Keyval::GDK_CONTROL_MASK. I am wrong ?