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

[Gregory Heytings]

> See for example patch below (which shouldn't be applied as-is since the 
> body of the function ends up misindented).

Indeed this patch works.

But now my question is: whould it not be possible to do this (namely, 
returning a lazy completion table) in one of the pcomplete-* functions (in 
`pcomplete-completions-at-point' itself, or in `pcomplete-completions', 
or...), instead of doing this in the individual functions ultimately 
called by `pcomplete-completions-at-point'?