Improve performance of name sorting in town and station list windows

src/station_cmd.cpp

@@ -456,6 +456,26 @@ void UpdateAllStationVirtCoords()
 	}
 }
 
+void BaseStation::FillCachedName()
+{
+	char buf[256];
+	int64 args_array[] = { this->index };
+	StringParameters tmp_params(args_array);
+	char *end = GetStringWithArgs(buf, Waypoint::IsExpected(this) ? STR_WAYPOINT_NAME : STR_STATION_NAME, &tmp_params, lastof(buf));
+	char *alloced = MallocT<char>(end - buf + 1);
+	memcpy(alloced, buf, end - buf + 1);
+	this->cached_name.reset(alloced);
+}
+
+void ClearAllStationCachedNames()
+{
+	BaseStation *st;
+
+	FOR_ALL_BASE_STATIONS(st) {
+		st->cached_name.reset();
+	}
+}
+
 /**
  * Get a mask of the cargo types that the station accepts.
  * @param st Station to query
@@ -4006,6 +4026,7 @@ CommandCost CmdRenameStation(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 	}
 
 	if (flags & DC_EXEC) {
+		st->cached_name.reset();
 		free(st->name);
 		st->name = reset ? nullptr : stredup(text);