If you draw y(x) = x as custom line and have linear axis, everything is fine. However, switching an axis to log has the unexpected consequence that y(x) is NOT x anymore. I understand the logic that if you switch the y axis to log you have log10(y(x)) = x. However, this is completely strange in my opinion. Please add the option that the curve is sill y(x) = x but only DISPLAYED differently when an axis is switched to log.