bug#59935: 29.0.60; project-list-buffers is slow

[Juri Linkov]

>> > Do you have the time to finish the fix yourself? It was your feature, after
>> > all.
>> 
>> Here is a complete patch tested for all possible cases:
>> - emacs 28/29
>> - with/without file arg
>> - with/without reverting
>
> Thanks, but I hope you don't intend to ask to install this on the
> release branch.  And changing back the signature of
> list-buffers-noselect is extremely problematic, even though we changed
> it only for Emacs 29.
>
> Please try to find a safer, more compatible solution.

This is the safest solution for the emacs-29 branch.