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
}
/**
 * Adds support for dropping items into this viewer via
 * a user drag-and-drop operation.
 *
 * @param operations a bitwise OR of the supported drag and drop operation
 *  types (<code>DROP_COPY</code>, <code>DROP_LINK</code>, and <code>DROP_MOVE</code>)
 * @param transferTypes the transfer types that are supported by the drop operation
 * @param listener the callback that will be invoked after the drag and drop operation finishes
 * @see org.eclipse.swt.dnd.DND
 */
public void addDropSupport(int operations, Transfer[] transferTypes, final DropTargetListener listener) {
	Control control = getControl();
	DropTarget dropTarget = new DropTarget(control, operations);
	dropTarget.setTransfer(transferTypes);
	dropTarget.addDropListener(listener);
}
/**
 * Adds the given filter to this viewer,
 * and triggers refiltering and resorting of the elements.
 *
 * @param filter a viewer filter
 */
public void addFilter(ViewerFilter filter) {
	if (filters == null)
		filters = new ArrayList();
	filters.add(filter);
	refresh();
}
/**