bug#66166: 30.0.50; [PATCH] Consider outline-heading-end-regexp in outline-font-lock-keywords

[Juri Linkov <juri@linkov.net>]

close 66166 30.0.50
thanks

>>> Consider outline-heading-end-regexp in outline-font-lock-keywords.
>>>
>>> Example of use case:
>>> 1) emacs -Q
>>> 2) in *scratch* buffer, type ";;; Hello" in a new line, plus some line breaks
>>> 3) eval:
>>>    (setq-local outline-regexp ";;;*")
>>>    (setq-local outline-heading-end-regexp "\n")
>>>    (setq-local outline-minor-mode-highlight 'override)
>>>    (custom-set-faces '(outline-1 ((t :background "red" :extend t))))
>>>    (outline-minor-mode 1)
>>> 4) expected: since the outline-1 face has the extend attribute and the
>>> heading regexp ends in a line break, the outline-1 face on ";;; Hello"
>>> should be applied until the line break (extended)
>>>
>>> Patch:
>>> -                      (concat "^\\(?:" outline-regexp "\\).*"))
>>> +                      (concat "^\\(?:" outline-regexp "\\).*" outline-heading-end-regexp))
>>
>> Thanks, your patch looks right.  I wonder if it might break something,
>> maybe need more testing.
>
> Did you have a chance to do more testing here?  Should this patch be
> installed?  Thanks in advance.

I have used this change all the time from September 2023 without any problems.
So now this is installed in master.

>> Then it will fix the extend attribute only when outlines are expanded.
>> But when collapsed, changes in the display engine are required
>> to support the extend attribute over the ellipsis (bug#65896).

This could be implemented in another bug report.