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/AbstractTreeViewer.java
/**
 * Gets the expanded elements that are visible
 * to the user. An expanded element is only
 * visible if the parent is expanded.
 * 
 * @return the visible expanded elements
 * @since 2.0
 */
public Object[] getVisibleExpandedElements() {
	ArrayList v= new ArrayList();
	internalCollectVisibleExpanded(v, getControl());
	return v.toArray();
}
	
private void internalCollectVisibleExpanded(ArrayList result, Widget widget){
	Item[] items = getChildren(widget);
	for (int i = 0; i < items.length; i++) {
		Item item = items[i];
		if (getExpanded(item)) {
			Object data = item.getData();
			if (data != null)
				result.add(data);
			
			
			internalCollectVisibleExpanded(result, item);
		}
	}
}
}