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

[Juri Linkov]

> I've noticed that when I call #'tab-bar-new-tab while I'm in a
> side-window that has siblings, I get an error from
> #'window--sides-check, which happens when #'tab-bar-new-tab calls
> #'delete-other-windows. Here's an example of my problem:
> ...
> The attached patch fixes this issue. Could it be applied to the emacs-29
> branch?

Thanks.  Unless Eli has objections, I'd like to push the patch
to the emacs-29 branch since it correctly fixes the problem.