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

[Glenn Morris]

David Shepherd wrote:

> When pop-up-frames is non-nil and calendar is called a duplicate frame
> is created.
>
> To reproduce the issue do:
>
>     (setq pop-up-frames 'graphic-only)
>     (calendar)
>
> from a raw emacs -Q.

Sorry, I don't understand what the bug is supposed to be?
You asked for new frames to be popped up, and you got one.