bug#64536: 30.0.50; Make cl-print put buttons on ellipses

[Ihor Radchenko]

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

> -;; Define button type used for ...'s.
> -;; Set skip property so you don't have to TAB through 100 of them to
> -;; get to the next function name.
> -(define-button-type 'backtrace-ellipsis
> -  'skip t 'action #'backtrace-expand-ellipsis
> -  'help-echo "mouse-2, RET: expand this ellipsis")

Isn't this a breaking change?
I just got inspector.el broken because it uses 'backtrace-ellipsis
button type.

At least, I'd expect to see the removal documented in NEWS.

-- 
Ihor Radchenko // yantar92,
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