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

[Stefan Monnier]

>> 1. TAB calls completion-at-point
>> 2. completion-at-point calls pcomplete-completions-at-point, which
>> calls pcomplete/cd; this completes the directory name

Sounds like a bug: the `completion-at-point-functions` should not
perform the completion but should only return a description of the part
of the text that is the subject of completion, along with a description
(generally in the form of a function) of the set of elements from which
the possible completions can be taken.


        Stefan