fix pathfinding oversight.

Author: Warboy1982

src/Battlescape/Pathfinding.cpp

@@ -413,6 +413,7 @@ int Pathfinding::getTUCost(const Position &startPosition, int direction, Positio
 			cost += wallcost;
 			if (_unit->getFaction() == FACTION_HOSTILE && 
 				destinationTile->getUnit() &&
+				destinationTile->getUnit()->getFaction() == FACTION_HOSTILE &&
 				destinationTile->getUnit() != _unit)
 				cost += 32; // try to find a better path, but don't exclude this path entirely.
 

src/Battlescape/UnitWalkBState.cpp

@@ -285,6 +285,13 @@ void UnitWalkBState::think()
 
 			Position destination;
 			int tu = _pf->getTUCost(_unit->getPosition(), dir, &destination, _unit, 0, false); // gets tu cost, but also gets the destination position.
+			if (_unit->getFaction() == FACTION_HOSTILE &&
+				_parent->getSave()->getTile(destination)->getUnit() &&
+				_parent->getSave()->getTile(destination)->getUnit()->getFaction() == FACTION_HOSTILE &&
+				_parent->getSave()->getTile(destination)->getUnit() != _unit)
+			{
+				tu -= 32; // we artificially inflate the TU cost by 32 points in getTUCost under these conditions, so we have to deflate it here.
+			}
 			if (_falling)
 			{
 				tu = 0;