bug#13260: 24.3.50; save match data for core functions like `delete-char' and `delete-backward-char'?

[Bastien]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> I know the policy is to let any function assume the match data
>> are not saved, but I think an exception would be useful here.
>
> Why?

Because delete-char is very low-level and because it is hard to
guess why it would modify the match data -- hence very easy to
assume it will not, while it does.  Principle of least surprise?

-- 
 Bastien