bug#43645: 26.3; emacsclient -c does not open to correct window

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: bluetrack121@gmail.com,  43645@debbugs.gnu.org
> Date: Sun, 27 Sep 2020 18:44:20 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So I think (a) this is a corner and unimportant use case, and (b) it
> > probably has something to do with how we select a buffer to display
> > when 2 buffers are already on display and the user requests to see one
> > of them.
> 
> Yes.  And I was wrong -- the bug also appears in a C-x 2 split, not just
> a C-x 3 split.

Makes sense, because the two cases should be indistinguishable when
selecting a buffer to show is concerned.