bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing.

[Gregory Heytings]

> > Eli, I've been away for a month, and apparently I forgot to push the 
> > merge.  Sorry for that.  Is this still okay now?
>
> You've got to be kidding!  I was thinking about releasing Emacs 29.1 
> soon!

Sorry again.

> Please show the full diffs of the proposed merge, I will have to think 
> about this again, and think hard.

You can get them by checking out the scratch/long-lines-cleanup and doing 
"git diff emacs-29..."  Just in case, I attach the full diff.  Most of it 
are renamings and documentation improvements.  The main code change is the 
function 'get_nearby_bol_pos' used by 'get_small_narrowing_begv'.

> > By the way, I think we should add a hook and run it when long line 
> > optimizations are activated, so that users can, for example, 
> > automatically turn modes that are known to be problematic off.  WDYT?
>
> I don't think we should add hooks without real-life use cases that we 
> understand and consider important.  Hooks called by redisplay are 
> especially problematic, and should be added very sparingly.

Okay.

long-lines-cleanup.diff
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