bug#51648: 28.0.60; `tab-bar-close-button' and `tab-bar-new-button' should be documented in the manual

[Eli Zaretskii]

> Date: Sun, 07 Nov 2021 11:07:07 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> I wanted to find out how to customize the image used for tab bar
> buttons, but could not find anything in the manual.
> 
> It seems that setting the display property of `tab-bar-close-button' and
> `tab-bar-new-button' is the way to go.
> 
> Shouldn't such an important customization be documented somewhere in the
> manual?

No, not necessarily.  The manual is not supposed to document all the
customizations we have, only the important ones.

What should be possible is to find the customization by browsing the
tab-bar Custom group.  If that is not currently possible (I didn't
check), then we should probably do something to fix that.