bug#41423: 27.0.91; eshell file completion in tramp dir is slow (3 minutes) [regression on pretest]

[Stefan Monnier]

> This will print:
>
> calling pcomplete-completions-at-point
> returning from pcomplete-completions-at-point, call took 0.00 seconds
> calling pcomplete-completions-at-point
> returning from pcomplete-completions-at-point, call took 0.00 seconds
> calling pcomplete-completions-at-point
> returning from pcomplete-completions-at-point, call took N seconds
[...]
> Note again that this third call to pcomplete-completions-at-point does
> nothing useful.  It just build a list of all possible commands, and throws
> it away.

Exactly.

And the fix is to make this third call return in 0.00 seconds like the
others by making it return not the list of commands but a mere function
(which will return that list of commands only when called, but in the
present case it won't be called).


        Stefan