[gnome-nibbles/arnaudb/wip/gtk4: 166/188] Other small fix.

[Arnaud B. <arnaudb src gnome org>]

commit 332b08700a555c085a7775a6bdd0023304a036b0
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 13c8a3f..1f8fa01 100644
--- a/src/nibbles-window.vala
+++ b/src/nibbles-window.vala
@@ -563,7 +563,7 @@ 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;
         }