Gets a command to delete the selected columns in the table.
readonly deleteTableColumns: DeleteTableColumnsCommand
A DeleteTableColumnsCommand object that provides methods for executing the command and checking its state.
You can invoke this command by calling the execute method.
The execute method checks the command state (obtained using the getState method) before executing, and decides whether the action can be performed. The execute and getState methods are members of the DeleteTableColumnsCommand class.
The command deletes each column (including merged cells) if at least one column cell is contained in the selection.