#### hara-kiri-group-interface

A group spanner that keeps track of interesting items. If it doesn't contain any after linebreaking, then it will remove itself and all its children.

##### User settable properties:

`remove-first` (boolean)
  Remove the first staff of a orchestral score?

##### Internal properties:

`items-worth-living` (list of grobs)
  A list of interesting items. If empty in a particular staff, then that staff is erased.

This grob interface is used in the following graphical objects: RemoveEmptyVerticalGroup

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