bug#62427: tab-bar-new-tab-to now handles cases with multiple side-windows

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Tue, 16 May 2023 20:32:56 +0300
> 
> This guard is pushed to master.  But the root problem still persists.
> It can be reproduced in emacs-28/29/30:
> 
> 0. emacs -Q
> 1. M-x
> 2. C-x t 2
> 3. C-x o     ;; switches to the minibuffer
> 4. C-x t 2

Why does the last command in this scenario make sense?

The below also signals an error:

  emacs -Q
  M-x
  C-x 2

Looks appropriate to me.

If you are arguing for a better error message in your case, I'm okay
with diagnosing that specific situation and emitting a more focused,
user-friendly error.