planes attacking works; post-attack glitches though

OpenRa.Game/Traits/Activities/FlyAttack.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Game.Traits.Activities
+{
+	class FlyAttack : IActivity
+	{
+		public IActivity NextActivity { get; set; }
+		Actor Target;
+
+		public FlyAttack(Actor target) { Target = target; }
+
+		public IActivity Tick(Actor self)
+		{
+			if (Target == null || Target.IsDead) return NextActivity;
+
+			var limitedAmmo = self.traits.GetOrDefault<LimitedAmmo>();
+			if (limitedAmmo != null && !limitedAmmo.HasAmmo())
+				return NextActivity;
+
+			return Util.SequenceActivities(
+				new Fly(Target.CenterLocation),
+				new FlyTimed(50, 20),
+				this);
+		}
+
+		public void Cancel(Actor self) { Target = null; NextActivity = null; }
+	}
+}