Bug 294303 [Markers] 'Queuing Viewer Updates' in Problems view
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
* @return IMarker[]
	 */
	IMarker[] getAllMarkers() {
		MarkerSupportItem[] elements = builder.getClonedMarkers().getElements();
		Collection allMarkers = new ArrayList();
		for (int i = 0; i < elements.length; i++) {
			addMarkers(elements[i], allMarkers);
		}
		IMarker[] markers = new IMarker[allMarkers.size()];
		allMarkers.toArray(markers);
		return markers;
	}
	/**
	 * Return the builder for the receiver.
	 * 
	 * @return CachedMarkerBuilder
	 */
	CachedMarkerBuilder getBuilder() {
		return builder;
	}
	/**
	 * Get the categories to expand for the receiver.
	 * 
	 * @return Collection of MarkerCategory.
	 */
	Collection getCategoriesToExpand() {
		if (categoriesToExpand == null) {
			categoriesToExpand = new HashSet();
			if (this.memento != null) {
				IMemento expanded = this.memento.getChild(TAG_EXPANDED);