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
/**
	 * A map from the viewer's model elements to SWT widgets.
	 * (key type: <code>Object</code>, value type: <code>Widget</code>).
	 * <code>null</code> means that the element map is disabled.
	 */
	private Map elementMap;
	/**
	 * This viewer's sorter.
	 * <code>null</code> means there is no sorter.
	 */
	private ViewerSorter sorter;