Merge pull request #7126 from penev92/bleed_sandworm

Fix worms not releasing targets when they move deep onto rock

OpenRA.Mods.RA/Activities/Attack.cs

@@ -24,6 +24,7 @@ public class Attack : Activity
 		readonly IFacing facing;
 		readonly WRange minRange;
 		readonly WRange maxRange;
+		readonly IPositionable positionable;
 
 		public Attack(Actor self, Target target, WRange minRange, WRange maxRange, bool allowMovement)
 		{
@@ -33,6 +34,7 @@ public Attack(Actor self, Target target, WRange minRange, WRange maxRange, bool
 
 			attack = self.Trait<AttackBase>();
 			facing = self.Trait<IFacing>();
+			positionable = self.Trait<IPositionable>();
 
 			move = allowMovement ? self.TraitOrDefault<IMove>() : null;
 		}
@@ -52,6 +54,9 @@ protected virtual Activity InnerTick(Actor self, AttackBase attack)
 			var type = Target.Type;
 			if (!Target.IsValidFor(self) || type == TargetType.FrozenActor)
 				return NextActivity;
+
+			if (attack.Info.AttackRequiresEnteringCell && !positionable.CanEnterCell(Target.Actor.Location, null, false))
+				return NextActivity;
 
 			// Drop the target if it moves under the shroud / fog.
 			// HACK: This would otherwise break targeting frozen actors