Merge pull request #11982 from obrakmann/fix11979-helicopter-reservations

Fix helicopter reservations

OpenRA.Mods.Common/Traits/Air/Aircraft.cs

@@ -111,7 +111,7 @@ namespace OpenRA.Mods.Common.Traits
 		public CPos TopLeft { get { return self.World.Map.CellContaining(CenterPosition); } }
 		public int TurnSpeed { get { return Info.TurnSpeed; } }
 		public Actor ReservedActor { get; private set; }
-		public bool MayYieldReservation;
+		public bool MayYieldReservation { get; private set; }
 
 		bool airborne;
 		bool cruising;
@@ -282,6 +282,14 @@ namespace OpenRA.Mods.Common.Traits
 			}
 		}
 
+		public void AllowYieldingReservation()
+		{
+			if (reservation == null)
+				return;
+
+			MayYieldReservation = true;
+		}
+
 		public void UnReserve()
 		{
 			if (reservation == null)