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Calculation of chord length in RBend wrong

Summary

When the deflection angle is negative then the chord length that is calculated in RBend is wrong. In a rectangular bend when the orientation of the face relative to the beam (E1) is half of the deflection angle then the chord length should be equal to the length of the dipole. Instead the calculated length is as if E1 was multiplied by -1.

Steps to reproduce

Add OPTION, LOGBENDTRAJECTORY=TRUE; to the input file and track a bunch through a rectangular bend with ANGLE < 0 and E1 = ANGLE / 2. Then look up the distance in the file data/<input_fname>_<bend_name>_traj.dat between the two locations where the reference particle crosses x=0.

What is the current bug behavior?

The current chord length is as if E1 = -ANGLE / 2.

What is the expected correct behavior?

The chord length should be equal to L in the description of the bend in the input file.