Require force move for all undeploy-triggering orders.

OpenRA.Mods.Common/Traits/Buildings/TransformsIntoAircraft.cs

@@ -33,6 +33,9 @@ namespace OpenRA.Mods.Common.Traits
 		[VoiceReference]
 		public readonly string Voice = "Action";
 
+		[Desc("Require the force-move modifier to display the move cursor.")]
+		public readonly bool RequiresForceMove = false;
+
 		public override object Create(ActorInitializer init) { return new TransformsIntoAircraft(init, this); }
 	}
 
@@ -66,6 +69,14 @@ namespace OpenRA.Mods.Common.Traits
 			}
 		}
 
+		public bool AircraftCanEnter(Actor a, TargetModifiers modifiers)
+		{
+			if (Info.RequiresForceMove && !modifiers.HasModifier(TargetModifiers.ForceMove))
+				return false;
+
+			return AircraftCanEnter(a);
+		}
+
 		public bool AircraftCanEnter(Actor a)
 		{
 			return !self.AppearsHostileTo(a) && Info.DockActors.Contains(a.Info.Name);