gistfile1.txt

THE CODE:
        this.window = new Breadcrumb("Window", this);
        this.window.connect("activate", function(o) {
                let global = Shell.Global.get();
                let window = global.screen.get_display().get_focus_window();
                if (window) {
                    let compositor = global.screen.get_display().get_compositor();
                    compositor.maximize_window(window, window.get_rect());
                }
            });
        this.actor.append(this.window.button, Big.BoxPackFlags.EXPAND);

THE ERROR:
    JS ERROR: !!!   Exception in callback for signal: activate
    JS ERROR: !!!     message = 'Unhandled GType void releasing SYMBOL GArgument'
    JS ERROR: !!!     lineNumber = '0'
    JS ERROR: !!!     fileName = 'gjs_throw'
    JS ERROR: !!!     stack = 'Error("Unhandled GType void releasing SYMBOL GArgument")@:0
("Unhandled GType void releasing SYMBOL GArgument")@gjs_throw:0
@:0
([object Object])@/home/sander/gnome-shell/source/gnome-shell/js/ui/breadcrumbs.js:85
_emit("activate")@/home/sander/gnome-shell/install/share/gjs-1.0/signals.js:124
([object Object])@/home/sander/gnome-shell/source/gnome-shell/js/ui/breadcrumbs.js:122
()@/home/sander/gnome-shell/source/gnome-shell/js/ui/breadcrumbs.js:245
([object _private_Big_Box],[object _private_Clutter_Event])@/home/sander/gnome-shell/source/gnome-shell/js/ui/breadcrumbs.js:207

THE INTROSPECTION DATA:
      <method name="maximize_window"
              c:identifier="meta_compositor_maximize_window">
        <return-value transfer-ownership="none">
          <type name="none" c:type="void"/>
        </return-value>
        <parameters>
          <parameter name="window" transfer-ownership="none">
            <type name="Window" c:type="MetaWindow*"/>
          </parameter>
          <parameter name="window_rect" transfer-ownership="none">
            <type name="Rectangle" c:type="MetaRectangle*"/>
          </parameter>
        </parameters>
      </method>
[...]
    <record name="Rectangle" c:type="MetaRectangle">
      <field name="x" writable="1">
        <type name="int" c:type="int"/>
      </field>
      <field name="y" writable="1">
        <type name="int" c:type="int"/>
      </field>
      <field name="width" writable="1">
        <type name="int" c:type="int"/>
      </field>
      <field name="height" writable="1">
        <type name="int" c:type="int"/>
      </field>
      <method name="to_string" c:identifier="meta_rectangle_to_string">
[...]