Bug 294303 [Markers] 'Queuing Viewer Updates' in Problems view
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
}
	/**
	 * Return a new clone to use in UI.Can return
	 * null if markers are changing or building.
	 * @see CachedMarkerBuilder#createMarkersClone()
	 * 
	 * 
	 * @return Object
	 */
	Markers createViewerInputClone() {
		return builder.createMarkersClone();
	}
	/**
	 * Get all of the fields visible in the receiver.
	 * 
	 * @return MarkerField[]
	 */
	MarkerField[] getVisibleFields() {
		return generator.getVisibleFields();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.ViewPart#init(org.eclipse.ui.IViewSite,
	 * org.eclipse.ui.IMemento)
	 */
	public void init(IViewSite site, IMemento memento) throws PartInitException {
		super.init(site, memento);
		ContentGeneratorDescriptor generatorDescriptor = null;
		if (memento != null) {