Check if weapon without self-reloading is out of ammo when deciding validity

This should prevent attacking helicopters (or other actors) staying at the range to target of a weapon that is out of ammo and needs manual reloading at a RearmBuilding or via upgrades.

OpenRA.Mods.Common/Traits/Armament.cs

@@ -259,6 +259,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		public bool IsReloading { get { return FireDelay > 0 || IsTraitDisabled; } }
 		public bool ShouldExplode(Actor self) { return !IsReloading; }
+		public bool OutOfAmmo { get { return ammoPool != null && !ammoPool.Info.SelfReloads && !ammoPool.HasAmmo(); } }
 
 		public WVec MuzzleOffset(Actor self, Barrel b)
 		{

OpenRA.Mods.Common/Traits/Attack/AttackBase.cs

@@ -186,7 +186,7 @@ namespace OpenRA.Mods.Common.Traits
 
 			// PERF: Avoid LINQ.
 			foreach (var armament in Armaments)
-				if (armament.Weapon.IsValidAgainst(t, self.World, self))
+				if (!armament.OutOfAmmo && armament.Weapon.IsValidAgainst(t, self.World, self))
 					return true;
 
 			return false;
@@ -203,6 +203,10 @@ namespace OpenRA.Mods.Common.Traits
 			{
 				if (armament.IsTraitDisabled)
 					continue;
+
+				if (armament.OutOfAmmo)
+					continue;
+
 				var range = armament.Weapon.MinRange;
 				if (min > range)
 					min = range;
@@ -222,6 +226,10 @@ namespace OpenRA.Mods.Common.Traits
 			{
 				if (armament.IsTraitDisabled)
 					continue;
+
+				if (armament.OutOfAmmo)
+					continue;
+
 				var range = armament.MaxRange();
 				if (max < range)
 					max = range;
@@ -242,6 +250,9 @@ namespace OpenRA.Mods.Common.Traits
 				if (armament.IsTraitDisabled)
 					continue;
 
+				if (armament.OutOfAmmo)
+					continue;
+
 				if (!armament.Weapon.IsValidAgainst(target, self.World, self))
 					continue;
 
@@ -265,6 +276,9 @@ namespace OpenRA.Mods.Common.Traits
 				if (armament.IsTraitDisabled)
 					continue;
 
+				if (armament.OutOfAmmo)
+					continue;
+
 				if (!armament.Weapon.IsValidAgainst(target, self.World, self))
 					continue;