Bug 283676 [FieldAssist] ControlDecoration should add @noextend API tooling tag
SSIA
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
hideHover();
			return;
		}
		
		if (control == null) {
			return;
		}
		
		if (hover == null) {
			hover = new Hover(hoverNear.getShell());
		}
		hover.setText(text, getDecorationRectangle(control.getParent()),
				control);
		hover.setVisible(true);
	}
	/*
	 * Remove any listeners installed on the controls.
	 */
	private void removeControlListeners() {
		if (control == null) {
			return;
		}
		printRemoveListener(control, "FOCUS"); 
		control.removeFocusListener(focusListener);
		focusListener = null;
		printRemoveListener(control, "DISPOSE"); 
		control.removeDisposeListener(disposeListener);
		disposeListener = null;
		Composite c = control.getParent();
		while (c != null) {