I'm using the latest packages for Debian made by os-cillation.
It looks like the "inconsistent" state of a GtkCellRendererToggle cannot be
distinguished from a cell renderer whose state is active=FALSE;

Reproducible: Always
Steps to Reproduce:
1. Set up any xfce theme and use an application that must show both active=FALSE
and inconsistent cell renderer toggle. 

Actual Results:  
The two states are drawn the same way

Expected Results:  
A straight line should be drawn inside boxes that are in "inconsistent" state.