Fix damage transition sounds

OpenRA.Game/Traits/Health.cs

@@ -110,6 +110,7 @@ namespace OpenRA.Traits
 					Attacker = attacker,
 					Damage = damage,
 					DamageState = this.DamageState,
+					PreviousDamageState = oldState,
 					DamageStateChanged = this.DamageState != oldState,
 					Warhead = warhead
 				});

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -26,6 +26,7 @@ namespace OpenRA.Traits
 		public WarheadInfo Warhead;
 		public int Damage;
 		public DamageState DamageState;
+		public DamageState PreviousDamageState;
 		public bool DamageStateChanged;
 	}
 

OpenRA.Mods.RA/Render/RenderBuilding.cs

@@ -63,12 +63,12 @@ namespace OpenRA.Mods.RA.Render
 			
 			if (e.DamageState == DamageState.Dead)	
 				self.World.AddFrameEndTask(w => w.Add(new Explosion(w, self.CenterLocation.ToInt2(), "building", false)));
-			else if (e.DamageState >= DamageState.Heavy)
+			else if (e.DamageState >= DamageState.Heavy && e.PreviousDamageState < DamageState.Heavy)
 			{
 				anim.ReplaceAnim("damaged-idle");
 				Sound.Play(self.Info.Traits.Get<BuildingInfo>().DamagedSound, self.CenterLocation);
 			}
-			else
+			else if (e.DamageState < DamageState.Heavy)
 				anim.ReplaceAnim("idle");
 		}
 

OpenRA.Mods.RA/Render/RenderBuildingTurreted.cs

@@ -33,12 +33,12 @@ namespace OpenRA.Mods.RA.Render
 		{
 			if (!e.DamageStateChanged) return;
 
-			if (e.DamageState >= DamageState.Heavy)
+			if (e.DamageState >= DamageState.Heavy && e.PreviousDamageState < DamageState.Heavy)
 			{
 				anim.ReplaceAnim("damaged-idle");
 				Sound.Play(self.Info.Traits.Get<BuildingInfo>().DamagedSound, self.CenterLocation);
 			}
-			else
+			else if (e.DamageState < DamageState.Heavy)
 				anim.ReplaceAnim("idle");
 		}
 	}