Remove deprecated NPC debug buttons (#15824)

Content.Server/NPC/HTN/HTNSystem.cs

@@ -223,11 +223,10 @@ public sealed class HTNSystem : EntitySystem
                         {
                             text.AppendLine($"BTR: {string.Join(", ", comp.Plan.BranchTraversalRecord)}");
                             text.AppendLine($"tasks:");
-
-                            foreach (var task in comp.Plan.Tasks)
-                            {
-                                text.AppendLine($"- {task.ID}");
-                            }
+                            var root = _prototypeManager.Index<HTNCompoundTask>(comp.RootTask);
+                            var btr = new List<int>();
+                            var level = -1;
+                            AppendDebugText(root, text, comp.Plan.BranchTraversalRecord, btr, ref level);
                         }
 
                         RaiseNetworkEvent(new HTNMessage()
@@ -247,6 +246,49 @@ public sealed class HTNSystem : EntitySystem
         }
     }
 
+    private void AppendDebugText(HTNTask task, StringBuilder text, List<int> planBtr, List<int> btr, ref int level)
+    {
+        // If it's the selected BTR then highlight.
+        for (var i = 0; i < btr.Count; i++)
+        {
+            text.Append('-');
+        }
+
+        text.Append(' ');
+
+        if (task is HTNPrimitiveTask primitive)
+        {
+            text.AppendLine(primitive.ID);
+            return;
+        }
+
+        if (task is HTNCompoundTask compound)
+        {
+            level++;
+            text.AppendLine(compound.ID);
+            var branches = _compoundBranches[compound];
+
+            for (var i = 0; i < branches.Length; i++)
+            {
+                var branch = branches[i];
+                btr.Add(i);
+                text.AppendLine($" branch {string.Join(" ", btr)}:");
+
+                foreach (var sub in branch)
+                {
+                    AppendDebugText(sub, text, planBtr, btr, ref level);
+                }
+
+                btr.RemoveAt(btr.Count - 1);
+            }
+
+            level--;
+            return;
+        }
+
+        throw new NotImplementedException();
+    }
+
     private void Update(HTNComponent component, float frameTime)
     {
         // If we're not planning then countdown to next one.