Bug 265422 [FieldAssist] Field assist hint popup border is black
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
if (!control.isVisible()) {
			return false;
		}
		if (showOnlyOnFocus) {
			return hasFocus;
		}
		return true;
	}
	/*
	 * If in debug mode, print info about adding the specified listener.
	 */
	private void printAddListener(Widget widget, String listenerType) {
		listenerInstalls++;
		if (DEBUG) {
			System.out
					.println("Added listener>>>" + listenerType + " to>>>" + widget); 
		}
	}
	/*
	 * If in debug mode, print info about adding the specified listener.
	 */
	private void printRemoveListener(Widget widget, String listenerType) {
		listenerInstalls--;
		if (DEBUG) {
			System.out
					.println("Removed listener>>>" + listenerType + " from>>>" + widget); 
		}
	}
}