Introduce IDefaultVisibility.

OpenRA.Mods.Common/Traits/Modifiers/AlwaysVisible.cs

@@ -0,0 +1,24 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("The actor is always considered visible for targeting and rendering purposes.")]
+	public class AlwaysVisibleInfo : TraitInfo<AlwaysVisible>, IDefaultVisibilityInfo { }
+	public class AlwaysVisible : IDefaultVisibility
+	{
+		public bool IsVisible(Actor self, Player byPlayer)
+		{
+			return true;
+		}
+	}
+}