(svn r15643) -Fix [FS#2711]: be more strict with zeroing unused map array bits

src/tree_map.h

@@ -274,6 +274,8 @@ static inline void MakeTree(TileIndex t, TreeType type, uint count, uint growth,
 	_m[t].m3 = type;
 	_m[t].m4 = 0 << 5 | 0 << 2;
 	_m[t].m5 = count << 6 | growth;
+	SB(_m[t].m6, 2, 4, 0);
+	_me[t].m7 = 0;
 }
 
 #endif /* TREE_MAP_H */