Bug 72615 [Viewers] Need and ITableFontProvider
We released an ITabelColorProvider for M2 - we should have a corresponding ITableFontProvider
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
* @return a new hashtable
	 * 
	 * @since 3.0
	 */
	CustomHashtable newHashtable(int capacity) {
		return new CustomHashtable(capacity, getComparer());
	}
	/**
	 * Attempts to preserves the current selection across a run of the given
	 * code.
	 * <p>
	 * The default implementation of this method:
	 * <ul>
	 * <li>discovers the old selection (via <code>getSelection</code>)</li>
	 * <li>runs the given runnable</li>
	 * <li>attempts to restore the old selection (using
	 * <code>setSelectionToWidget</code></li>
	 * <li>rediscovers the resulting selection (via <code>getSelection</code>)
	 * </li>
	 * <li>calls <code>handleInvalidSelection</code> if the selection did not
	 * take</li>
	 * <li>calls <code>postUpdateHook</code></li>
	 * </ul>
	 * </p>
	 * 
	 * @param updateCode
	 *            the code to run
	 */
	protected void preservingSelection(Runnable updateCode) {
		ISelection oldSelection = null;