bug#81512: [PATCH] Add command `outline-occur'

Michael Heerdegen <[email protected]> writes:

> BTW, what I did not yet understand is why you must locally modify the
> behavior of `occur' in this case, but not for other `occur' invocations.

The first version of `outline-occur' called `occur' this way:

  (let ((occur-hook (lambda () (pop-to-buffer "*Occur*"))))
    (occur (concat "^\\(?:" regexp "\\)")))

This was done because it was convenient to pop to the Occur window and
just start navigating the outline.

However, Juri pointed out that:

  > overriding `occur-hook' with `pop-to-buffer' is not the right way to
  > customize the buffer display behavior.

For the specific case of `outline-occur', it was probably fine to just
call `occur' and carry on with the default behaviour.  However, there
were already other similar situations that required workarounds.  So, we
decided to add `display-buffer-default-alist' and address those as well.
One example of such a situation is Bug#81233.

  https://lists.gnu.org/archive/html/emacs-devel/2026-08/msg00157.html

        Roi