Re: New package `outline-occur'

>> Maybe we could simply allow an application to *append*
>> new rules to the end of 'display-buffer-alist',
>> thus not overriding the user customization?
>
> Sounds dangerous. What would happen when a user customizes
> 'display-buffer-alist' while it's let-bound?  Note that I'm not against
> the "app-action" idea and I think that appending it to
> 'display-buffer-alist' won't reduce the overhead it introduces.  But we
> have to splice it in correctly into the list of actions we construct and
> we have to be able to document it well.

Agreed, let's add app-action and test it on outline-occur
after it's implemented in the new feature request on the bug list.