bug#53949: Setting (font-lock-mode 0) in very large buffers will cause highlight-symbol-at-point to fail to highlight all matches

[Juri Linkov]

>> emacs version is 27.2 (Installed using dnf on fedora 35 system)
>>
>> test file: https://github.com/torvalds/linux/blob/v5.16/kernel/events/core.c
>
> Better test URL:  
> https://raw.githubusercontent.com/torvalds/linux/v5.16/kernel/events/core.c
>
>> Step1: emacs -Q kernel/events/core.c
>> Step2: eval "(font-lock-mode 0)"
>> Step3: eval "(highlight-regexp "static")"
>>
>> The "static" keyword at the end of the file is not highlighted.
>
> I can reproduce this in Emacs 27.2, but not in Emacs 29, so I guess this
> has been fixed now.

In Emacs 28 the default value of `hi-lock-highlight-range'
was increased from 200000 to 2000000.