WPI PIDController doesn't account for varying dT?

[FRC4ME]

I was looking through WPI's PIDController code and noticed that they do not incorporate dT into the calculations anywhere. For example, the calculate() method contains the line:

m_totalError += m_error;

Shouldn't it be like this?

m_totalError += m_error * m_period;

The way it is now, changing the period of the PID loop would require resetting of the I and D constants. Multiplying the integral by the period and dividing the derivative by the period would remove this inconvenience.