first commit

NitroxPatcher/Patches/Persistent/MainMenuRightSide_OpenGroup_Patch.cs

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+using System.Reflection;
+using NitroxClient.MonoBehaviours.Gui.MainMenu;
+using NitroxClient.MonoBehaviours.Gui.MainMenu.ServerJoin;
+using NitroxModel.Helper;
+
+namespace NitroxPatcher.Patches.Persistent;
+
+public partial class MainMenuRightSide_OpenGroup_Patch : NitroxPatch, IPersistentPatch
+{
+    private static readonly MethodInfo TARGET_METHOD = Reflect.Method((MainMenuRightSide t) => t.OpenGroup(default(string)));
+
+    public static void Prefix(string target)
+    {
+        // Stopping the client if we leave the joining process
+        if (target is not (MainMenuJoinServerPanel.NAME or MainMenuEnterPasswordPanel.NAME or MainMenuNotificationPanel.NAME))
+        {
+            JoinServerBackend.StopMultiplayerClient();
+        }
+    }
+}