bug#56682: Fix the long lines font locking related slowdowns

[Ihor Radchenko]

Gregory Heytings <gregory@heytings.org> writes:

>> `org-indent-line' (the value of `indent-line-function' in Org mode) does 
>> require invoking parser in order to determine the syntactic object at 
>> point, which, in turn, needs to consider the full buffer contents. This 
>> is prescribed by Org syntax. We cannot avoid this.
>>
>
> Do you really mean that there is no way to avoid invoking the parser on 
> the whole buffer, and to possibly process 20 MB of data, when 
> org-indent-line is called?

In the worst-case scenario, yes. However, it is usually not the case.
org-indent-line usually needs to look no further than the parent
headline - a few lines above in the majority of Org documents.

-- 
Ihor Radchenko,
Org mode contributor,
Learn more about Org mode at https://orgmode.org/.
Support Org development at https://liberapay.com/org-mode,
or support my work at https://liberapay.com/yantar92