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
for (int i = 0; i < listeners.length; ++i) {
		((IOpenListener)listeners[i]).open(event);
	}
}
/**
 * Notifies any post selection listeners that a post selection event has been received.
 * Only listeners registered at the time this method is called are notified.
 *
 * @param event a selection changed event
 * 
 * @see addPostSelectionChangedListener
 */
protected void firePostSelectionChanged(SelectionChangedEvent event) {
	Object[] listeners = postSelectionChangedListeners.getListeners();
	for (int i = 0; i < listeners.length; ++i) {
		((ISelectionChangedListener)listeners[i]).selectionChanged(event);
	}
}
/**
 * Returns the filtered array of children of the given element.
 * The resulting array must not be modified,
 * as it may come directly from the model's internal state.
 *
 * @param parent the parent element
 * @return a filtered array of child elements
 */
protected Object[] getFilteredChildren(Object parent) {
	Object[] result = getRawChildren(parent);
	if (filters != null) {
		for (Iterator iter = filters.iterator(); iter.hasNext();) {