Bug 335308 [JFace] JavaDoc of ControlDecoration#setDescriptionText is wrong
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
/**
	 * Add any listeners needed on the target control and on the composite where
	 * the decoration is to be rendered.
	 */
	private void addControlListeners() {
		disposeListener = new DisposeListener() {
			public void widgetDisposed(DisposeEvent event) {
				dispose();
			}
		};
		printAddListener(control, "DISPOSE"); 
		control.addDisposeListener(disposeListener);
		focusListener = new FocusListener() {
			public void focusGained(FocusEvent event) {
				hasFocus = true;
				if (showOnlyOnFocus) {
					update();
				}
			}
			public void focusLost(FocusEvent event) {
				hasFocus = false;
				if (showOnlyOnFocus) {
					update();
				}
			}
		};
		printAddListener(control, "FOCUS"); 
		control.addFocusListener(focusListener);
		
		paintListener = new PaintListener() {