optimize UpdateBreakpoint

Author: yileicn

src/Infrastructure/BotSharp.Abstraction/Conversations/IConversationService.cs

@@ -51,6 +51,7 @@ Task<bool> SendMessage(string agentId,
     /// </summary>
     /// <param name="resetStates">Whether to reset all states</param>
     /// <param name="reason">Append user init words</param>
+    /// <param name="excludedStates"></param>
     /// <returns></returns>
-    Task UpdateBreakpoint(bool resetStates = false, string? reason = null);
+    Task UpdateBreakpoint(bool resetStates = false, string? reason = null, params string[] excludedStates);
 }

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.UpdateBreakpoint.cs

@@ -22,7 +22,12 @@ public async Task UpdateBreakpoint(bool resetStates = false, string? reason = nu
         {
             var states = _services.GetRequiredService<IConversationStateService>();
             // keep language state
-            if(excludedStates.IsNullOrEmpty()) excludedStates = new string[] { StateConst.LANGUAGE };
+            if (excludedStates == null) excludedStates = new string[] { };
+            if (!excludedStates.Contains(StateConst.LANGUAGE))
+            {
+                excludedStates = excludedStates.Append(StateConst.LANGUAGE).ToArray();
+            }
+
             states.CleanStates(excludedStates);
         }