This test fails intermittently: sanity/client/SwingSet/src/ButtonDemoScreenshotTest.java

The problem described in JDK-8198920 could be a product bug. To discover more about what is actually happening, some more instrumentation is needed.

Specifically, it is important to understand wether the action listener was called upon mouse release. If the action listener is not called, that could mean that the problem is in graphics.