Test name: SwingSet2.jar
Product(s) tested: JDK8u202 b04(64bit) , JDK12b21
OS/architecture:Oel7.5 uek x64
VM Options:-Djdk.gtk.version=3 -Djdk.gtk.verbose=true
1. Run the demo with the gtk version set at command line to 2 and then to 3.
2. Compare the rendering of the JToolTip by placing the mouse on any of the demo toggle buttons.
Expected: Tooltip is black with its t4ext being clearly visible.
Actual: on GTK3.0 the Tooltip is transparent with its text not clearly visible.
Seen on jdk8u202b04 as well as jdkb12.