Saving a content type display should not return up to the Manage Displays list

When you save a change to a content type display mode - like add a new fieldgroup, for instance - you're returned up to the list of all display modes. If you have 5 fieldgroups to add, that gets pretty tiresome.

It works better for Manage fields but that's because there's no list to return to - the main display for the tab is the list of fields.

It would be better if Save on a display mode just returned you to the form you're on.