Bug 198089 [ToolTips] Open/Add new API for ToolTips
- don't make shouldCreateToolTip final - add new API method ColumnViewerToolTipSupport#createToolTipContentArea(Event, Object, Composite) - Allow DefaultToolTips displayed more than once (For ToolTips in ToolTips).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewerToolTipSupport.java
private ColumnViewer viewer;
	private static final String LABEL_PROVIDER_KEY = Policy.JFACE
			+ "_LABEL_PROVIDER"; 
	private static final String ELEMENT_KEY = Policy.JFACE + "_ELEMENT_KEY"; 
	private static final int DEFAULT_SHIFT_X = 10;
    private static final int DEFAULT_SHIFT_Y = 0;
	/**
	 * Enable ToolTip support for the viewer by creating an instance from this
	 * class. To get all necessary informations this support class consults the
	 * {@link CellLabelProvider}.
	 *
	 * @param viewer
	 *            the viewer the support is attached to
	 * @param style style passed to control tool tip behavior
	 *
	 * @param manualActivation
	 *            <code>true</code> if the activation is done manually using
	 *            {@link #show(Point)}