Some icons render incorrectly on Windows

There is a strange rendering bug with certain icons on Windows:

<img src="https://user-images.githubusercontent.com/35271042/50796491-9b2f5980-1286-11e9-817d-334734b8f47e.png" width="50%" />


This does not repro on the Mac:

<img width="303" alt="image" src="https://user-images.githubusercontent.com/35271042/50796434-5f948f80-1286-11e9-95bc-c97487853e13.png">
