Commit 9013247e84699f6a8d963ab98cabd16f16972dfb
2016-10-14T03:03:17
md_rollback: Optimize. We skip over as many marks a possible in mot cases. This fixes e.g. the pathological case generated by command $ python -c 'print (("*a **a " * 65000) + "b" + (" a** a*" * 65000))'