bug#57082: 29.0.50; emacs-news-view-mode breakage

[Juri Linkov]

>> I think that's wrong, yes. Every GUI I'm familiar with does it the other way:
>>
>>   > Closed Item
>>   v Open Item
>>     > Closed Sub Item
>>
>> This is the visual style used in GNOME (at least, the theme I'm using), MS
>> Windows, macOS, Firefox/Thunderbird, and probably others. More importantly,
>> it's also the style Emacs already uses elsewhere: see the Customize UI.
>
> Ah, of course, I didn't even think to look there (oops again).
>
> diff --git a/lisp/outline.el b/lisp/outline.el
> index 7750f9a75d..8132043097 100644
> --- a/lisp/outline.el
> +++ b/lisp/outline.el
> @@ -294,16 +294,16 @@ outline-minor-mode-use-buttons
>    :version "29.1")
>  
>  (define-icon outline-open button
> -  '((emoji "▶️")
> -    (symbol " ⯈ ")
> +  '((emoji "🔽")
> +    (symbol " ⯆ ")
>      (text " open "))
>    "Icon used for buttons for opening a section in outline buffers."
>    :version "29.1"
>    :help-echo "Open this section")

It seems the problem is somewhere else - in code that uses these definitions,
because here semantically everything is correct: the outline-open button
for opening a section means that the current state of the button is closed.
This assumes that in "outline-open" the word "open" is a verb.