bug#19256: 24.3; Bad interaction between calendar.el and pop-up-frames

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

>> If that's still not very clear (sorry it's quite difficult to explain) then
>> it might be easier to just try it and see watch what happens.
>
> Rest assured I did actually try it. I can still only say that AFAICS you
> get what you ask for.

If I understand correctly, the problem is this:

(progn
  (setq pop-up-frames 'graphic-only)
  (setq calendar-setup 'two-frames)
  (calendar))

This will pop up three new frames, and one of them is empty.  I've now
fixed this in Emacs 28 -- but only for the non-nil calendar-setup case.
When it's nil, it seems natural that pop-up-frames should be heeded.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no