ElDoc: Add more commands using 'eldoc-add-command-completions'

Add more commands to 'eldoc-add-command-completions' to fix
disappearing ElDoc help in the minibuffer for the following
cases:
- All modes: Added "comment-indent-new-line".
- All modes: Added "delete-char" for handling when the user presses delete.
- Python mode: Added "python-indent-dedent-line-backspace" for handling
  when the user presses backspace.
* lisp/emacs-lisp/eldoc.el (eldoc-remove-command-completions):
* lisp/progmodes/python.el (python-base-mode): Add more commands
to 'eldoc-add-command-completions'.

Copyright-paperwork-exempt: yes

1 files changed, 1 insertions, 0 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 741b94e187b..b6db6097d9f 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -7147,6 +7147,7 @@ implementations: `python-mode' and `python-ts-mode'."
           (add-hook 'eldoc-documentation-functions #'python-eldoc-function nil t)
         (add-function :before-until (local 'eldoc-documentation-function)
                       #'python-eldoc-function))))
+  (eldoc-add-command-completions "python-indent-dedent-line-backspace")
 
   ;; TODO: Use tree-sitter to figure out the block in `python-ts-mode'.
   (dolist (mode '(python-mode python-ts-mode))