Control the extra spaces inserted in completion in eshell and Shell command

[shrubbroom]

I am using corfu 20250128.821 in emacs-mac 29.4. With the following minimal configurations.

(package-initialize)
(require 'corfu)
(setq corfu-auto t
      corfu-auto-prefix 1
      corfu-auto-delay 0
      global-corfu-minibuffer t)
(global-corfu-mode)

Extra spaces would be inserted in eshell or Shell Command (M-!).
For example, in eshell, input cd and corfu would complete with the exact match. When the match is expanded, an extra space would be inserted after cd.

2025-03-26.3.29.03.mov

This also happens when using ENTER to select match. Here, an extra space is inserted after tmp/

2025-03-26.3.30.28.mov

In Shell command, the space is also inserted. Here, an extra space is inserted after emacs

2025-03-26.3.34.18.mov

As a comparison, in emacs-lisp-mode, these spaces are not inserted.

2025-03-26.3.35.28.mov

How to avoid insert these extra spaces?

[minad]

I think the pcomplete-default-exit-function is responsible for the space. See pcomplete-termination-string.

[shrubbroom]

With (setq pcomplete-termination-string ""), the spaces inserted in eshell can be avoided. However, the shell-command still has spaces inserted. I tried emacs 30.0.50 and this issue persists.