bug#51247: 28.0.60; Insufficient documentation of tab-bar.el internal functions

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: 51247@debbugs.gnu.org
> Date: Thu, 21 Oct 2021 20:48:47 +0300
> 
> >> The nil value is supported only for the case when a function
> >> is on the tab-bar-format list, but its return value depends
> >> on some variable, and on some conditions might return nil.
> >>
> >> An example is tab-bar-format-history: when tab-bar-history-mode
> >> is nil, then tab-bar-format-history returns nil, but it doesn't break
> >> the tab bar.
> >
> > OK, but what I want to say is what effect do such functions have on
> > the tab bar appearance when they return nil?  It sounds like you say
> > that the appearance is not affected in any way in that case?
> 
> Exactly, they have no effect.

Thanks.