Bug 82798 TableViewer internalRefresh is very slow as of 1.19
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
* This method should be called (by the content provider) when a single
	 * element has been added to the model, in order to cause the viewer to
	 * accurately reflect the model. This method only affects the viewer, not
	 * the model. Note that there is another method for efficiently processing
	 * the simultaneous addition of multiple elements.
	 * </p>
	 * 
	 * @param element
	 *            the element to add
	 */
	public void add(Object element) {
		add(new Object[] { element });
	}
	/**
	 * Cancels a currently active cell editor. All changes already done in the
	 * cell editor are lost.
	 */
	public void cancelEditing() {
		tableViewerImpl.cancelEditing();
	}
	/*
	 *  (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#doFindInputItem(java.lang.Object)
	 */
	protected Widget doFindInputItem(Object element) {
		if (equals(element, getRoot()))
			return getTable();
		return null;
	}
	/*