Road stops: Add bit for whether stop is being drawn in the build window

src/newgrf_extension.cpp

@@ -58,7 +58,7 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("action0_object_edge_foundation_mode", 2),
 	GRFFeatureInfo("action0_object_flood_resistant", 1),
 	GRFFeatureInfo("action0_object_viewport_map_tile_type", 1),
-	GRFFeatureInfo("road_stops", 8),
+	GRFFeatureInfo("road_stops", 9),
 	GRFFeatureInfo("new_landscape", 2),
 	GRFFeatureInfo("more_objects_per_grf", 1, GFTOF_MORE_OBJECTS_PER_GRF),
 	GRFFeatureInfo("more_action2_ids", 1, GFTOF_MORE_ACTION2_IDS),

src/newgrf_roadstop.cpp

@@ -164,6 +164,8 @@ uint32 RoadStopScopeResolver::GetVariable(uint16 variable, uint32 parameter, Get
 					RoadCachedOneWayState rcows = GetRoadCachedOneWayState(this->tile);
 					if (rcows <= RCOWS_NO_ACCESS) result |= (rcows << 2);
 				}
+			} else {
+				SetBit(result, 4);
 			}
 			return result;
 		}