bug#47771: 27.1; `Info-read-node-name` throws error during completion

[Lars Ingebrigtsen <larsi@gnus.org>]

Daniel Mendler <mail@daniel-mendler.de> writes:

> 1. M-x icomplete-mode
> 2. Press "C-h i"
> 3. Press "g" to run `Info-goto-node`
> 4. Enter "(boom)"
> 5. Move around with the cursor left to right or wait until the
> `icomplete-post-command-hook` fails.
>
> In order to fix the issue, the following patch can be applied:
>
> diff --git a/info.el b/info-patched.el
> index 3bed743..42a7fce 100644
> --- a/info.el
> +++ b/info-patched.el
> @@ -1881,7 +1881,8 @@ See `completing-read' for a description of
> arguments and usage."
>           (lambda (string pred action)
>             (complete-with-action
>              action
> -            (Info-build-node-completions (Info-find-file file1 nil t))
> +            (let ((file2 (Info-find-file file1 'noerror t)))
> +              (and file2 (Info-build-node-completions file2)))

Thanks; applied to Emacs 28 (with some minor changes).

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