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/CheckboxTableViewer.java
public Object[] getCheckedElements() {
	TableItem[] children = getTable().getItems();
	ArrayList v = new ArrayList(children.length);
	for (int i = 0; i < children.length; i++) {
		TableItem item = children[i];
		if (item.getChecked())
			v.add(item.getData());
	}
	return v.toArray();
}
/**
 * Returns the grayed state of the given element.
 *
 * @param element the element
 * @return <code>true</code> if the element is grayed,
 *   and <code>false</code> if not grayed
 */
public boolean getGrayed(Object element) {
	Widget widget = findItem(element);
	if (widget instanceof TableItem) {
		return ((TableItem) widget).getGrayed();
	}
	return false;
}
/**
 * Returns a list of elements corresponding to grayed nodes in this
 * viewer.
 * <p>
 * This method is typically used when preserving the interesting
 * state of a viewer; <code>setGrayedElements</code> is used during the restore.