Bug 153943 [Viewers] Rename new API, e.g. RowPart -> ViewerRow
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
private TooltipSupport tooltipSupport;
	/**
	 * Create a new instance of the receiver.
	 */
	public ColumnViewer() {
		super();
		tooltipSupport = new TooltipSupport(this);
	}
	/**
	 * Get the cell at this point.
	 * <p>
	 * <i>Subclasses should overwrite this method and provide a meaningful
	 * implementation</i>