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
*
 * @see ICheckStateListener#checkStateChanged
 */
private void fireCheckStateChanged(CheckStateChangedEvent event) {
	Object[] listeners = checkStateListeners.getListeners();
	for (int i = 0; i < listeners.length; ++i) {
		((ICheckStateListener) listeners[i]).checkStateChanged(event);
	}
}
/* (non-Javadoc)
 * Method declared on ICheckable.
 */
public boolean getChecked(Object element) {
	Widget widget = findItem(element);
	if (widget instanceof TableItem) {
		return ((TableItem) widget).getChecked();
	}
	return false;
}
/**
 * Returns a list of elements corresponding to checked table items in this
 * viewer.
 * <p>
 * This method is typically used when preserving the interesting
 * state of a viewer; <code>setCheckedElements</code> is used during the restore.
 * </p>
 *
 * @return the array of checked elements
 * @see #setCheckedElements
 */