fixed SD-1583 - Finalize() is visible in C# override completion

src/Main/Base/Project/Src/Editor/CodeCompletion/OverrideCompletionItemProvider.cs

@@ -48,7 +48,7 @@ namespace ICSharpCode.SharpDevelop.Editor.CodeCompletion
 			LanguageProperties language = c.ProjectContent.Language;
 			OverrideCompletionItemList result = new OverrideCompletionItemList();
 			foreach (IMember m in GetOverridableMembers(c)) {
-				if (language.ShowMember(m, false)) {
+				if (language.ShowMemberInOverrideCompletion(m)) {
 					result.Items.Add(new OverrideCompletionItem(m));
 				}
 			}

src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/LanguageProperties.cs

@@ -228,6 +228,11 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 			return member.IsStatic == showStatic;
 		}
+		
+		public virtual bool ShowMemberInOverrideCompletion(IMember member)
+		{
+			return true;
+		}
 		#endregion
 		
 		/// <summary>
@@ -320,6 +325,18 @@ namespace ICSharpCode.SharpDevelop.Dom
 				}
 				return true;
 			}
+			
+			public override bool ShowMemberInOverrideCompletion(IMember member)
+			{
+				IMethod method = member as IMethod;
+				
+				if (method != null) {
+					if (method.Name == "Finalize" && method.Parameters.Count == 0)
+						return false;
+				}
+				
+				return base.ShowMemberInOverrideCompletion(member);
+			}
 		}
 		#endregion