Bug 240363 [Viewers] [open type] Problem with Open Type filtering
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTableViewer.java
*/
	protected abstract void doClearAll();
	/**
	 * Resets the given item in the receiver. The text, icon and other attributes
	 * of the item are set to their default values.
	 *
	 * @param item the item to reset
	 *
	 * @since 3.3
	 */
	protected abstract void doResetItem(Item item);
	/**
	 * Removes the items from the receiver which are between the given
	 * zero-relative start and end indices (inclusive).
	 *
	 * @param start
	 *            the start of the range
	 * @param end
	 *            the end of the range
	 *
	 * @exception IllegalArgumentException -
	 *                if either the start or end are not between 0 and the
	 *                number of elements in the list minus 1 (inclusive)
	 *
	 * @since 3.3
	 */
	protected abstract void doRemove(int start, int end);
	/**
	 * Removes all of the items from the receiver.
	 *