bug#69993: Wrap window buffers while cycling

[Juri Linkov]

>> The decision whether to support wrapping for 'switch-to-prev-buffer'
>> could depend on whether users who don't use the tab-line need it?
>
> Currently, 'switch-to-prev-buffer' always wraps.  So it misses two
> features:
>
> - Inhibit wrapping.
>
> - Restrict itself to the buffers shown in that window only.

The problem is that from the point of view of tab-line users
currently there is no wrapping because the tab-line already
restricts itself to the buffers shown in that window only.

But if you think that 'switch-to-prev-buffer-wrap' should be renamed
to something that makes no sense for tab-line users such as
'switch-to-prev-buffer-restrict', then still it can be used
from tab-line.el like this:

(when tab-line-switch-cycling
  (let-bind ((switch-to-prev-buffer-restrict tab-line-switch-cycling))
    (switch-to-prev-buffer window)))