bug#62216: Narrowed the issue to one line

[Paul Eggert]

On 8/22/23 08:08, Jonathon McKitrick wrote:
> Other than comparing the different lengths being calculated and reporting
> them, is there any other logging I should run locally that could shed
> light on this mystery?

Possibly the problem has to do with markers pointing into the buffer, so 
it might be helpful to log their contents before and after the insert in 
question. (Offhand I don't know how to do this.)