bug#5122: Mismatched parentheses when dealing with huge buffercontent

[Deniz Dogan]

2009/12/5 Drew Adams <drew.adams@oracle.com>:
>> > See option `blink-matching-paren-distance' and node
>> > Matching in the Emacs manual.
>> > Does increasing that variable's value resolve the problem?
>>
>> Yes, it does solve the problem.
>
> It's not real obvious when you see mismatch highlighting (and are used to it
> working) that the highlighting might not mean a mismatch at all, but just an
> insufficiently large option value. Many (most?) users will not even guess that
> there is such an option.
>
> Perhaps we could use a :help-echo property along with the mismatch highlight
> face, pointing to the option?
>
>

I'm not sure what the best solution would be, but it is indeed strange
that Emacs says that there was a parenthesis *mismatch*. Maybe it
would be better to say something along the lines of "Emacs was unable
to find a matching parenthesis in the previous X characters", but
obviously much more terse.