Fix evaluation of PBS entry signal conditional after reserve through.

src/pathfinder/yapf/yapf_costrail.hpp

@@ -192,9 +192,9 @@ private:
 	{
 		const Node *node = static_cast<const Node *>(node_ptr);
 		for (;;) {
-			TileIndex last_signal_tile = node->m_segment->m_last_signal_tile;
+			TileIndex last_signal_tile = node->m_last_non_reserve_through_signal_tile;
 			if (last_signal_tile != INVALID_TILE) {
-				Trackdir last_signal_trackdir = node->m_segment->m_last_signal_td;
+				Trackdir last_signal_trackdir = node->m_last_non_reserve_through_signal_td;
 				if (HasPbsSignalOnTrackdir(last_signal_tile, last_signal_trackdir)) {
 					return last_signal_tile;
 				} else {
@@ -347,14 +347,18 @@ public:
 						}
 					}
 
+					bool is_reserve_through = false;
 					if (ShouldCheckTraceRestrict(n, tile)) {
 						TraceRestrictProgramResult out;
-						bool is_reserve_through = false;
 						if (ExecuteTraceRestrict(n, tile, trackdir, cost, out, &is_reserve_through)) {
 							return -1;
 						}
 						if (is_reserve_through) n.m_num_signals_res_through_passed++;
 					}
+					if (!is_reserve_through) {
+						n.m_last_non_reserve_through_signal_tile = tile;
+						n.m_last_non_reserve_through_signal_td = trackdir;
+					}
 
 					n.m_num_signals_passed++;
 					n.m_segment->m_last_signal_tile = tile;

src/pathfinder/yapf/yapf_node_rail.hpp

@@ -129,6 +129,8 @@ struct CYapfRailNodeT
 	CYapfRailSegment *m_segment;
 	uint16            m_num_signals_passed;
 	uint16            m_num_signals_res_through_passed;
+	TileIndex         m_last_non_reserve_through_signal_tile;
+	Trackdir          m_last_non_reserve_through_signal_td;
 	union {
 		uint32          m_inherited_flags;
 		struct {
@@ -147,6 +149,8 @@ struct CYapfRailNodeT
 		if (parent == NULL) {
 			m_num_signals_passed      = 0;
 			m_num_signals_res_through_passed = 0;
+			m_last_non_reserve_through_signal_tile = INVALID_TILE;
+			m_last_non_reserve_through_signal_td = INVALID_TRACKDIR;
 			flags_u.m_inherited_flags = 0;
 			m_last_red_signal_type    = SIGTYPE_NORMAL;
 			/* We use PBS as initial signal type because if we are in
@@ -163,6 +167,8 @@ struct CYapfRailNodeT
 		} else {
 			m_num_signals_passed      = parent->m_num_signals_passed;
 			m_num_signals_res_through_passed = parent->m_num_signals_res_through_passed;
+			m_last_non_reserve_through_signal_tile = parent->m_last_non_reserve_through_signal_tile;
+			m_last_non_reserve_through_signal_td = parent->m_last_non_reserve_through_signal_td;
 			flags_u.m_inherited_flags = parent->flags_u.m_inherited_flags;
 			m_last_red_signal_type    = parent->m_last_red_signal_type;
 			m_last_signal_type        = parent->m_last_signal_type;