Re: master 8a88f3ed5ae: Add `outline-occur' command and `display-buffer-default-alist' variable

> We obviously could have 'display-buffer-overriding-action' accept an
> alist as value with the justification that the ACTION argument of
> 'display-buffer' can be a scalar too.  Would we like it?

Yes, I already thought about using the
existing 'display-buffer-overriding-action'
to support an alist with conditions as well.
Do you think it's possible to distinguish
these two cases in the same variable:

1. existing:
   (FUNCTIONS . ALIST)
2. new like in 'display-buffer-alist':
   ((CONDITION-1 FUNCTIONS . ALIST)
    (CONDITION-2 FUNCTIONS . ALIST)
    ...)