Materials displayed in Material Editor are jittery / shaky on Linux

Materials displayed in the material editor do not appear the same as on Windows platform. Edges of the material sphere appear jagged and flicker on Linux rather than being a crisp circular line (see screenshots).

Regression:
No - same behavior occurs in 4.17.2 (CL 3658906) on Linux as well

1. Download and open attached project
2. In the Content Browser, double click on Rolling->BaseMaterial to open

Result:
On Linux, the sphere appears jagged and rough around the edges

Expected:
Material display appears the same across platforms.