bug#1806: dired-pop-to-buffer in wrong place

[Stefan Monnier]

>> It may be suboptimal,
> What is the optimal behaviour in your opinion?

The optimal behavior depends on the user's intention, here.
Calendar can't know it.  So it should just strive to make it easy for
the user to get what she wants.

> This whole exercise seems to have been a waste of time.

Yes, I'm sorry about it, but clearly the new "automatic double split" is
not a good idea: sometimes it may correspond to what the user wanted,
but I expect it'll be rare, and as mentioned, it's a lot easy for those
users to hit C-x 3 before invoking calendar, than for the rest of them
to undo the damage.  KISS.


        Stefan