Add PF setting for whether to pathfind up to back of one-way PBS

src/lang/english.txt

@@ -1275,6 +1275,8 @@ STR_CONFIG_SETTING_ROAD_VEHICLE_SLOPE_STEEPNESS                 :Slope steepness
 STR_CONFIG_SETTING_ROAD_VEHICLE_SLOPE_STEEPNESS_HELPTEXT        :Steepness of a sloped tile for a road vehicle. Higher values make it more difficult to climb a hill
 STR_CONFIG_SETTING_FORBID_90_DEG                                :Forbid trains from making 90° turns: {STRING2}
 STR_CONFIG_SETTING_FORBID_90_DEG_HELPTEXT                       :90 degree turns occur when a horizontal track is directly followed by a vertical track piece on the adjacent tile, thus making the train turn by 90 degree when traversing the tile edge instead of the usual 45 degrees for other track combinations.
+STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING                :Pathfind up to back of one-way path signals: {STRING2}
+STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING_HELPTEXT       :When enabled, the YAPF train pathfinder may pathfind up to the back of a one-way path signal.
 STR_CONFIG_SETTING_DISTANT_JOIN_STATIONS                        :Allow to join stations not directly adjacent: {STRING2}
 STR_CONFIG_SETTING_DISTANT_JOIN_STATIONS_HELPTEXT               :Allow adding parts to a station without directly touching the existing parts. Needs Ctrl+Click while placing the new parts
 STR_CONFIG_SETTING_INFLATION                                    :Inflation: {STRING2}

src/pathfinder/yapf/yapf_costrail.hpp

@@ -697,7 +697,8 @@ no_entry_cost: // jump here at the beginning if the node has no parent (it is th
 				if (HasSignalOnTrackdir(next.tile, next.td) && IsPbsSignal(GetSignalType(next.tile, TrackdirToTrack(next.td)))) {
 					/* Possible safe tile. */
 					end_segment_reason |= ESRB_SAFE_TILE;
-				} else if (HasSignalOnTrackdir(next.tile, ReverseTrackdir(next.td)) && GetSignalType(next.tile, TrackdirToTrack(next.td)) == SIGTYPE_PBS_ONEWAY) {
+				} else if (likely(_settings_game.pf.back_of_one_way_pbs_waiting_point) && HasSignalOnTrackdir(next.tile, ReverseTrackdir(next.td)) &&
+						GetSignalType(next.tile, TrackdirToTrack(next.td)) == SIGTYPE_PBS_ONEWAY) {
 					/* Possible safe tile, but not so good as it's the back of a signal... */
 					end_segment_reason |= ESRB_SAFE_TILE | ESRB_DEAD_END;
 					extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;

src/settings_gui.cpp

@@ -1936,6 +1936,7 @@ static SettingsContainer &GetSettingsTree()
 				routing->Add(new SettingEntry("pf.pathfinder_for_trains"));
 				routing->Add(new SettingEntry("difficulty.line_reverse_mode"));
 				routing->Add(new SettingEntry("pf.reverse_at_signals"));
+				routing->Add(new SettingEntry("pf.back_of_one_way_pbs_waiting_point"));
 				routing->Add(new SettingEntry("pf.forbid_90_deg"));
 				routing->Add(new SettingEntry("pf.pathfinder_for_roadvehs"));
 				routing->Add(new SettingEntry("pf.pathfinder_for_ships"));

src/settings_type.h

@@ -529,6 +529,7 @@ struct PathfinderSettings {
 
 	bool   roadveh_queue;                    ///< buggy road vehicle queueing
 	bool   forbid_90_deg;                    ///< forbid trains to make 90 deg turns
+	bool   back_of_one_way_pbs_waiting_point;///< whether the back of one-way PBS signals is a safe waiting point
 	uint8  reroute_rv_on_layout_change;      ///< whether to re-route road vehicles when the layout changes
 
 	bool   reverse_at_signals;               ///< whether to reverse at signals at all

src/table/settings.ini

@@ -1327,15 +1327,22 @@ strhelp  = STR_CONFIG_SETTING_FORBID_90_DEG_HELPTEXT
 proc     = InvalidateShipPathCache
 cat      = SC_EXPERT
 
-;; pf.back_of_one_way_pbs_waiting_point
-[SDT_NULL]
-length   = 1
+[SDT_XREF]
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_JOKERPP)
+xref     = ""pf.back_of_one_way_pbs_waiting_point""
 
-;; pf.back_of_one_way_pbs_waiting_point
-[SDT_NULL]
-length   = 1
+[SDT_XREF]
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_CHILLPP, SL_CHILLPP_232)
+xref     = ""pf.back_of_one_way_pbs_waiting_point""
+
+[SDT_BOOL]
+base     = GameSettings
+var      = pf.back_of_one_way_pbs_waiting_point
+def      = true
+str      = STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING
+str      = STR_CONFIG_SETTING_BACK_ONE_WAY_PBS_SAFE_WAITING_HELPTEXT
+cat      = SC_EXPERT
+patxname = ""pf.back_of_one_way_pbs_waiting_point""
 
 [SDT_VAR]
 base     = GameSettings