Returns indices where items is next (in the direction of border)
to a cell containing NA; all outer borders are also NA.
| 1 2 3 4 5 6 | get_border_indices(
  items = NULL,
  border = "b",
  byrow = TRUE,
  include.widows = TRUE
)
 | 
| items | A list of items to arrange. | 
| border | Top ( | 
| byrow | Whether to fill rows or columns first per page. | 
| include.widows | 
 | 
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