Fix minelayers leaking enemy mine positions through the fog.

OpenRA.Mods.Cnc/Activities/LayMines.cs

@@ -108,7 +108,7 @@ namespace OpenRA.Mods.Cnc.Activities
 			{
 				var positionable = (IPositionable)movement;
 				minefield.RemoveAll(c => self.World.ActorMap.GetActorsAt(c)
-					.Any(a => a.Info.Name == minelayer.Info.Mine.ToLowerInvariant()) ||
+					.Any(a => a.Info.Name == minelayer.Info.Mine.ToLowerInvariant() && a.CanBeViewedByPlayer(self.Owner)) ||
 						(!positionable.CanEnterCell(c, null, BlockedByActor.Immovable) && !self.World.FogObscures(c)));
 			}
 		}