Add game event for TBTR replacement attempt

src/openttd.cpp

@@ -1730,5 +1730,6 @@ char *DumpGameEventFlags(GameEventFlags events, char *b, const char *last)
 	dump('d', GEF_COMPANY_DELETE);
 	dump('m', GEF_COMPANY_MERGE);
 	dump('n', GEF_RELOAD_NEWGRF);
+	dump('t', GEF_TBTR_REPLACEMENT);
 	return b;
 }

src/openttd.h

@@ -91,6 +91,7 @@ enum GameEventFlags : uint32 {
 	GEF_COMPANY_DELETE       = 1 << 0, ///< (d) A company has been deleted
 	GEF_COMPANY_MERGE        = 1 << 1, ///< (m) A company has been bought by another
 	GEF_RELOAD_NEWGRF        = 1 << 2, ///< (n) ReloadNewGRFData() has been called
+	GEF_TBTR_REPLACEMENT     = 1 << 3, ///< (t) CMD_TEMPLATE_REPLACE_VEHICLE has been called
 };
 DECLARE_ENUM_AS_BIT_SET(GameEventFlags)
 

src/vehicle.cpp

@@ -1379,6 +1379,8 @@ void CallVehicleTicks()
 		bool leaveDepot = it->second;
 		_vehicles_to_autoreplace.erase(it);
 
+		RegisterGameEvents(GEF_TBTR_REPLACEMENT);
+
 		/* Store the position of the effect as the vehicle pointer will become invalid later */
 		int x = t->x_pos;
 		int y = t->y_pos;