(svn r26875) -Codechange: move TropicZone information from m6 to type

src/saveload/afterload.cpp

@@ -574,6 +574,8 @@ bool AfterLoadGame()
 		/* In old savegame versions, the heightlevel was coded in bits 0..3 of the type field */
 		for (TileIndex t = 0; t < map_size; t++) {
 			_m[t].height = GB(_m[t].type, 0, 4);
+			SB(_m[t].type, 0, 2, GB(_m[t].m6, 0, 2));
+			SB(_m[t].m6, 0, 2, 0);
 		}
 	}