[gnome-nibbles/arnaudb/wip/gtk4: 29/40] Other small fix.

[Arnaud B. <arnaudb src gnome org>]

commit e26fb310fb1acb3bf0d71891eb9497a90b2f77a2
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Jun 16 11:28:45 2020 +0200

    Other small fix.

 src/nibbles-window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/nibbles-window.vala b/src/nibbles-window.vala
index 50d5331..b4d6c2a 100644
--- a/src/nibbles-window.vala
+++ b/src/nibbles-window.vala
@@ -470,7 +470,7 @@ private class NibblesWindow : ApplicationWindow
                 show_controls_screen ();
                 break;
             case "controls":
-                assert_not_reached ();
+                return; // happens in Gtk4, because the "speed" screen "Next" button continues to be 
clickable during the transition
             default:
                 return;
         }