Bug 157566 [Viewers] Application doesn't shutdown because background thread is running
This really a critical bug which should be fixed before M2 is out. In ToolTipSupport a Timer thread is started and never cancled if tooltips are not used!
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ToolTipSupport.java
private Shell tip;
		private TooltipHideListener hideListener = new TooltipHideListener();
		private Timer timer = new Timer();
		
		/* (non-Javadoc)
		 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
		 */
		public void handleEvent(Event event) {
			switch (event.type) {
			case SWT.Dispose:
				if( timer != null ) {
					timer.cancel();
				}
			case SWT.KeyDown:
			case SWT.MouseMove:
			case SWT.MouseDown:
				disposeTooltip(tip);
				break;
			case SWT.MouseHover:
				Point p = new Point(event.x, event.y);
				ViewerRow row = viewer.getRowPart(p);
				viewer.getControl().setToolTipText(""); 
				if (row != null) {
					popupTooltip(row, p);
				}
				break;
			}
		}
		
		/**