Since entry is now in read only mode .grab_focus () & etc is no longer needed;

Remove application_instance.set_accels_for_action (ACTION_PREFIX + ACTION_CLEAR, {"Escape"});
& let event control handle it or the escape button will not animate.

Since Gdk.Key.Return is user by default to trigger the selected UI element when navigating the UI with the arrow keys or the tab keys the equal button will never get pressed or fire, But instead the highlight button will be pressed so Gdk.Key.equal makes the most since

…cked function

- Exposing every single buttons like this isn't necessary & calling the for each button is a better idea EXP: activate_action(ACTION_INSERT, new GLib.Variant("s", "Character Gos Here")); is batter. 

The del calc button do not use glib actions 
Calling button_del_clicked(); & button_calc_clicked(); is nessary.

…upport_Redo