Add setting to enable through loading in UI

src/lang/english.txt

@@ -1320,6 +1320,8 @@ STR_CONFIG_SETTING_SHOW_PROGSIG_FEATURES                        :Show programmab
 STR_CONFIG_SETTING_SHOW_PROGSIG_FEATURES_HELPTEXT               :Show programmable signal feature. When disabled, the buttons to build and configure programmable signals are not shown in the UI, but are still available to all players.
 STR_CONFIG_SETTING_SHOW_VEH_LIST_CARGO_FILTER                   :Show cargo type filter in vehicle lists: {STRING2}
 STR_CONFIG_SETTING_SHOW_VEH_LIST_CARGO_FILTER_HELPTEXT          :Show cargo type filter in vehicle lists. When enabled vehicle list windows include an additional filter dropdown.
+STR_CONFIG_SETTING_SHOW_ADV_LOADING_MODE_FEATURES               :Show advanced loading mode features: {STRING2}
+STR_CONFIG_SETTING_SHOW_ADV_LOADING_MODE_FEATURES_HELPTEXT      :Show advanced loading mode features (through load/unload). When disabled, some advanced loading mode features are not shown in the UI, but are still available to all players.
 
 STR_CONFIG_SETTING_LANDSCAPE                                    :Landscape: {STRING2}
 STR_CONFIG_SETTING_LANDSCAPE_HELPTEXT                           :Landscapes define basic gameplay scenarios with different cargos and town growth requirements. NewGRF and Game Scripts allow finer control though

src/order_gui.cpp

@@ -1850,6 +1850,9 @@ public:
 				} else if (sel == this->selected_order) {
 					if (this->vehicle->type == VEH_TRAIN && sel < this->vehicle->GetNumOrders()) {
 						int osl = ((this->vehicle->GetOrder(sel)->GetStopLocation() + 1) % OSL_END);
+						if (osl == OSL_PLATFORM_THROUGH && !_settings_client.gui.show_adv_load_mode_features) {
+							osl = OSL_PLATFORM_NEAR_END;
+						}
 						if (osl == OSL_PLATFORM_THROUGH) {
 							for (const Vehicle *u = this->vehicle; u != NULL; u = u->Next()) {
 								/* Passengers may not be through-loaded */

src/settings_gui.cpp

@@ -1609,6 +1609,7 @@ static SettingsContainer &GetSettingsTree()
 			interface->Add(new SettingEntry("gui.show_vehicle_group_in_details"));
 			interface->Add(new SettingEntry("gui.show_vehicle_list_company_colour"));
 			interface->Add(new SettingEntry("gui.show_veh_list_cargo_filter"));
+			interface->Add(new SettingEntry("gui.show_adv_load_mode_features"));
 		}
 
 		SettingsPage *advisors = main->Add(new SettingsPage(STR_CONFIG_SETTING_ADVISORS));

src/settings_type.h

@@ -179,6 +179,7 @@ struct GUISettings {
 	bool   show_vehicle_route_steps;         ///< when a window related to a specific vehicle is focused, show route steps
 	bool   show_vehicle_list_company_colour; ///< show the company colour of vehicles which have an owner different to the owner of the vehicle list
 	bool   enable_single_veh_shared_order_gui;    ///< enable showing a single vehicle in the shared order GUI window
+	bool   show_adv_load_mode_features;      ///< enable advanced loading mode features in UI
 
 	uint16 console_backlog_timeout;          ///< the minimum amount of time items should be in the console backlog before they will be removed in ~3 seconds granularity.
 	uint16 console_backlog_length;           ///< the minimum amount of items in the console backlog before items will be removed.

src/table/settings.ini

@@ -4140,6 +4140,14 @@ strhelp  = STR_CONFIG_SETTING_ENABLE_SINGLE_VEH_SHARED_ORDER_GUI_HELPTEXT
 proc     = EnableSingleVehSharedOrderGuiChanged
 cat      = SC_EXPERT
 
+[SDTC_BOOL]
+var      = gui.show_adv_load_mode_features
+flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
+def      = false
+str      = STR_CONFIG_SETTING_SHOW_ADV_LOADING_MODE_FEATURES
+strhelp  = STR_CONFIG_SETTING_SHOW_ADV_LOADING_MODE_FEATURES_HELPTEXT
+cat      = SC_EXPERT
+
 ; For the dedicated build we'll enable dates in logs by default.
 [SDTC_BOOL]
 ifdef    = DEDICATED