> This variable may be overridden with a user-provided function to
> customize help text for tabs displayed on the tab-bar. Help text
> is normally shown in the echo area or via tooltips. See the
> variable's docstring for arguments passed to a help-text function.
>
> My current implementation, which fully overrides 'tab-bar--format-tab',
> uses a function that returns the buffer-list for current tabs, and wc-bl
> for others.
>
> Others might find this useful if they depend on help text.

Thanks.

> +(defun tab-bar-format-tab-help-text-default (tab _i current-p)

Is the argument 'current-p' really necessary?
It's easy to check if the argument 'tab' is current
with (eq (car tab) 'current-tab).

The argument 'current-p' was required for group-related functions since
it's harder to get the current group.  But for non-group it's simpler.

> +  (concat (alist-get 'name tab)
> +          (if current-p " (current tab)"
> +            " (click to visit tab)")))

This suffix would be nice only for demonstration purposes,
but in real use this extra text only adds visual clutter.