Inserts a descriptor at the specified (one-based) position in the receiving descriptor list, replacing the existing descriptor, if any, at that position.
- macOS 10.0+
The descriptor to insert in the receiver. Specifying an index of 0 or count + 1 causes appending to the end of the list.
The one-based descriptor list position at which to insert the descriptor.
Because it actually replaces the descriptor, if any, at the specified position, this method might better be called
replace. The receiver must be a list descriptor. The indices are one-based. Currently provides no indication if an error occurs.