Bug 15844 [Exception Handling] SelectionChange events and NPE
Build 20020508 Due to new global actions there are now more objects listening to selection changes send out by a JFace viewer. We now had the case that one of the listener generated a NPE. As a result all listeners registered after that one didn't receive the selection change event. StructuredViewers should be more fault tolorant to exceptions when informing listeners.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
}
/**
 * Updates the given elements' presentation when one or more of their properties change.
 * Only the given elements are updated.  
 * <p>
 * This does not handle structural changes (e.g. addition or removal of elements),
 * and does not update any other related elements (e.g. child elements).
 * To handle structural changes, use the <code>refresh</code> methods instead.
 * </p>
 * <p>
 * This should be called when an element has changed in the model, in order to have the viewer
 * accurately reflect the model.  This method only affects the viewer, not the model.
 * </p>
 * <p>
 * Specifying which properties are affected may allow the viewer to optimize the update.
 * For example, if the label provider is not affected by changes to any of these properties,
 * an update may not actually be required. Specifing <code>properties</code> as 
 * <code>null</code> forces a full update of the given elements.
 * </p>
 * <p>
 * If the viewer has a sorter which is affected by a change to one of the properties,
 * the elements' positions are updated to maintain the sort order.
 * </p>
 * <p>
 * If the viewer has a filter which is affected by a change to one of the properties,
 * elements may appear or disappear if the change affects whether or not they are 
 * filtered out.
 * </p>
 *
 * @param elements the elements