(svn r20373) -Feature: [NewGRF] callback 0x156 to use another name for airport layouts than the default "Layout x"

src/airport_gui.cpp

@@ -258,6 +258,11 @@ public:
 			case BAIRW_LAYOUT_NUM:
 				SetDParam(0, STR_STATION_BUILD_AIRPORT_LAYOUT_NAME);
 				SetDParam(1, _selected_airport_layout + 1);
+				if (_selected_airport_index != -1) {
+					const AirportSpec *as = GetAirportSpecFromClass(_selected_airport_class, _selected_airport_index);
+					StringID string = GetAirportTextCallback(as, _selected_airport_layout, CBID_AIRPORT_LAYOUT_NAME);
+					if (string != STR_UNDEFINED) SetDParam(0, string);
+				}
 				break;
 
 			default: break;

src/newgrf_callbacks.h

@@ -248,6 +248,9 @@ enum CallbackID {
 	 * used as a custom string ID in the 0xD000 range.
 	 */
 	CBID_AIRPORT_ADDITIONAL_TEXT         = 0x155, // 15 bit callback
+
+	/** Called to determine text to show as airport layout name. */
+	CBID_AIRPORT_LAYOUT_NAME             = 0x156, // 15 bit callback
 };
 
 /**