Fix powerdown effect + flash

OpenRa.Game/Effects/PowerDownIndicator.cs

@@ -9,7 +9,10 @@ namespace OpenRa.Game.Effects
 		Actor a;
 		Building b;
 		Animation anim = new Animation("powerdown");
-
+		bool removeNextFrame = false;
+		bool indicatorState = true;
+		int stateTicks = 0;
+		
 		public PowerDownIndicator(Actor a)
 		{
 			this.a = a;
@@ -19,8 +22,19 @@ namespace OpenRa.Game.Effects
 
 		public void Tick()
 		{
-			if (!b.Disabled || a.IsDead)
+			if (removeNextFrame == true)
 				Game.world.AddFrameEndTask(w => w.Remove(this));
+			
+			// Fix off-by one frame bug with undisabling causing low-power
+			if (!b.Disabled || a.IsDead)
+				removeNextFrame = true;
+			
+			// Flash power icon
+			if (++stateTicks == 15)
+			{
+				stateTicks = 0;
+				indicatorState = !indicatorState;
+			}
 		}
 
 		public IEnumerable<Renderable> Render()
@@ -28,7 +42,7 @@ namespace OpenRa.Game.Effects
 			foreach (var r in a.Render())
 				yield return r.WithPalette(PaletteType.Disabled);
 			
-			if (b.ManuallyDisabled)
+			if (b.ManuallyDisabled && indicatorState)
 				yield return new Renderable(anim.Image,
 				a.CenterLocation - .5f * anim.Image.size, PaletteType.Chrome);
 		}