When pressing PageUp on the opened choice the IAE get thrown:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: illegal Choice item position: -1
        at java.awt.Choice.select(Choice.java:413)
        at sun.awt.X11.XChoicePeer.keyPressed(XChoicePeer.java:255)
        at sun.awt.X11.XChoicePeer.handleJavaKeyEvent(XChoicePeer.java:196)
        at sun.awt.X11.XChoicePeer$1.run(XChoicePeer.java:982)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

How to reproduce:
1) run the test on linux
2) open a choice and press Down several times to remove items until only one extra item gets remained till the scrollbar becomes disappear. So far the scrollbar should still be visible.
3) close the choice
4) press the button (now every keypress will remove and then add item in the dropdown list)
5) open the choice
6) press PageDown and then PageUp
IAE should be thrown this time.