Adds a new column of cells to the right of the last column.
- macOS 10.0+
This method raises an
NSRange if there are 0 rows or 0 columns. This method creates new cells as needed with
renew to add new cells to an empty matrix.
If the number of rows or columns in the receiver has been changed with
renew, new cells are created only if they are needed. This fact allows you to grow and shrink an
NSMatrix without repeatedly creating and freeing the cells.
This method redraws the receiver. Your code may need to send
size after sending this method to resize the receiver to fit the newly added cells.