This is the base class for all SonarQube for Eclipse related notifications shown in the bottom right corner.
It is definitely not using the Notification API as it seems but I also don’t see the reference to Mylyn here
The plug-in is build against the latest Eclipse IDE with Java 11, 4.24 (2022-06), for compatibility with older versions and third-party applications build on-top of the Eclipse IDE.
Does this already feature the changes for the JFace API? It will definitely not yet feature the SVG changes if I’m not mistaken.