bug#6419: A suggestion for easier editing of lists in Custom buffers

[Lars Ingebrigtsen]

Mauro Aranda <maurooaranda@gmail.com> writes:

> Yes, here it is.  I fixed the typo, and tried to improve
> the help-echo of the INS button.

Thanks, applied to Emacs 28 with one super-minor tweak:

> +          (last-deleted (let ((lst (widget-get widget :last-deleted)))
> +                          (and lst (prog1 (pop lst)
> +                                     (widget-put widget :last-deleted lst))))

I made this into a `when-let' instead of the let+and.

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