"Notify group members of changes via email" on Group Admin page doesn't function

[burtadsit]

That option can't possibly do anything 'cause the parameter $notify_members is missing in the function declaration.

function groups_edit_base_group_details( $group_id, $group_name, $group_desc, $group_news )

should be:

function groups_edit_base_group_details( $group_id, $group_name, $group_desc, $group_news, $notify_members )

Then it gets picked up and used later in the body of the fn. Turned off for a reason? Dunno.