https://docs.oracle.com/en/java/javase/25/docs/api/java.desktop/javax/swing/plaf/basic/BasicScrollPaneUI.ViewportChangeHandler.html
BasicScrollPaneUI.ViewportChangeHandler (Java SE 25 & JDK 25)
declaration: module: java.desktop, package: javax.swing.plaf.basic, class: BasicScrollPaneUI, class: ViewportChangeHandler
java sejdk