The number of cells that were pasted.
This can be used to perform actions on all the pasted cells, the current cell should be the last pasted cell.
The previous local clipboard interaction related to the pasted cells.
If the pasted cells have been copied or cut from the same notebook, this value
will be the last interaction that was performed on the local clipboard. It should
be either copy, cut or paste.
If the pasted cells have been copied or cut from another notebook, this value
will be null.
An interface for the pasted cells event.