[gnome-chess] No longer need to keep event controllers alive

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 72cbf108eafce616973941df4d71867f2fb79874
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Dec 27 09:01:00 2020 -0600

    No longer need to keep event controllers alive
    
    The controller is now owned by its widget.

 src/chess-view.vala | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)
---
diff --git a/src/chess-view.vala b/src/chess-view.vala
index f41a123..5aa877b 100644
--- a/src/chess-view.vala
+++ b/src/chess-view.vala
@@ -19,8 +19,6 @@ public class ChessView : Gtk.DrawingArea
     private Cairo.Surface? selected_model_surface;
     private string loaded_theme_name = "";
 
-    private Gtk.GestureClick click_controller; // for keeping in memory
-
     private ChessScene _scene;
     public ChessScene scene
     {
@@ -42,7 +40,10 @@ public class ChessView : Gtk.DrawingArea
     {
         Object (scene: scene);
 
-        init_mouse ();
+        var click_controller = new Gtk.GestureClick (); // only reacts to Gdk.BUTTON_PRIMARY
+        click_controller.pressed.connect (on_click);
+        add_controller (click_controller);
+
         set_draw_func (draw);
 
         hexpand = true;
@@ -275,13 +276,6 @@ public class ChessView : Gtk.DrawingArea
         c.paint_with_alpha (alpha);
     }
 
-    private void init_mouse ()
-    {
-        click_controller = new Gtk.GestureClick ();    // only reacts to Gdk.BUTTON_PRIMARY
-        click_controller.pressed.connect (on_click);
-        add_controller (click_controller);
-    }
-
     private void on_click (Gtk.GestureClick _click_controller, int n_press, double event_x, double event_y)
     {
         if (scene.game == null || scene.game.should_show_paused_overlay)