bug#52143: 29.0.50; Customize type `group' displays a hanging colon

[martin rudalics]

>>From what I gather: a colon is necessary, for whatever reason.  So having a
> tag-less type, as `group' claims to be, is not possible through normal means.

I don't know why 'group' should be "tag-less" (whatever that incurs)
and thus would simply use

(define-widget 'group 'default
  "A widget which groups other widgets inside."
  :convert-widget 'widget-types-convert-widget
  :copy 'widget-types-copy
  :tag "Group"
  :format "%{%t%}:\n%v"
  ...

But maybe there is a reason for the current specification.

martin