- items: an array of all the root CEItem objects in this context
Returns the deepest CEItem at the given zero-based character index location. May return
null if no item exists at the given index.
Note that returned items may not share the same parent! Some items might be deeper than others, because this method tries to find every top-level item inside the range.
Returns the deepest item that fully encloses the given Range range. May be
null if no such item is found.