bug#3566: 23.0.94; explain why not to use group defined by define-minor-mode

[Lars Magne Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> In the Elisp manual and in the doc string for define-minor-mode, we
> are told not to use the custom group that is automatically defined for
> the mode variable, unless we have explicitly used defgroup to define
> the group.
>
> Why? Please provide some explanation.
>
> If you use `define-globalized-minor-mode', then the generated group
> (with the name of the _local_ minor mode) is recognized by
> `customize-group', and the mode variable for the global mode is
> recognized by `customize-variable'.
>
> Why is it inadvisable to use the same generated group for other
> defcustoms without explicitly defining the group? What negative
> consequences arise if that is attempted? Please explain in the doc.
>
> The Elisp manual, node Defining Minor Modes, seems to refer you to
> node `Group Definitions' for the explanation of this warning, but
> there is no such explanation there:
>
> "*Warning:* don't use this default group name unless you have
> written a `defgroup' to define that group properly. *Not
> Group Definitions."

Yes, this seems rather puzzling.  Anybody know the reason?

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