Fix Clone() in Query.

Author: cemahseri

QueryBuilder/Include.cs

@@ -7,5 +7,16 @@ public class Include
         public string ForeignKey { get; set; }
         public string LocalKey { get; set; }
         public bool IsMany { get; set; }
+
+        public Include Clone()
+        {
+            var clone = new Include();
+            clone.Name = this.Name;
+            clone.Query = this.Query.Clone();
+            clone.ForeignKey = this.ForeignKey;
+            clone.LocalKey = this.LocalKey;
+            clone.IsMany = this.IsMany;
+            return clone;
+        }
     }
 }

QueryBuilder/Query.cs

@@ -51,12 +51,12 @@ internal int GetLimit(string engineCode = null)
         public override Query Clone()
         {
             var clone = base.Clone();
-            clone.Parent = Parent;
+            clone.Parent = (Parent as Query)?.Clone();
             clone.QueryAlias = QueryAlias;
             clone.IsDistinct = IsDistinct;
             clone.Method = Method;
-            clone.Includes = Includes;
-            clone.Variables = Variables;
+            clone.Includes = Includes.Select(i => i.Clone()).ToList();
+            clone.Variables = Variables.ToDictionary();
             return clone;
         }