bug#69993: Wrap window buffers while cycling

[Juri Linkov <juri@linkov.net>]

>>>    (defcustom switch-to-prev-buffer-wrap nil
>>
>> The only problem is that this doesn't mention wrapping.
>
> Isn't the paragraph starting with "If this is t, ..." enough?

No, because this feature is about wrapping buffers
visible on the tab-line.

>>> But I still think that the '-wrap' postfix creates a misnomer.  The
>>> primary intention of this option is to restrict the set of candidate
>>> buffers ...
>>
>> The real misnomer is 'tab-line-switch-cycling'.
>> It should be renamed 'tab-line-switch-wrap'.
>
> For me "cycling" and "wrapping" stand for the same effect.  The major
> difference is that when the above option is made non-nil, the set of
> candidate buffers changes.  OTOH, when it's nil, Emacs wraps/cycles
> while when it's 'stop' it doesn't.  That's confusing.

Ok, since this feature is intended for the users of the tab-line, who
intuitively understand what it's doing, so it's not confusing for them,
here is what I'm going to do: I'll rebind 'C-x C-left' and 'C-x C-right'
in 'tab-line-mode' and will use tab-line functions to implement wrapping
of visible tabs/buffers.  Basically this means just adding a new map:

  (defvar-keymap tab-line-mode-map
    "C-x <left>" #'tab-line-switch-to-prev-tab
    "C-x C-<left>" #'tab-line-switch-to-prev-tab
    "C-x <right>" #'tab-line-switch-to-next-tab
    "C-x C-<right>" #'tab-line-switch-to-next-tab)

So no problem, tab-line.el is the right place since later I could
also implement drag'n'drop of tabs to allow manually changing
the order of buffers in the window buffers list.