Bug 294303 [Markers] 'Queuing Viewer Updates' in Problems view
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkersChangeListener.java
*/
	protected void preBuild() {
		preBuildTime = System.currentTimeMillis();
	}
	/**
	 * @param added
	 */
	private void handleAddedEntries(List added) {
		Iterator iterator = added.iterator();
		while (iterator.hasNext()) {
			MarkerEntry entry = (MarkerEntry) iterator.next();
			if (generator.select(entry)) {
				markerEntryList.add(entry);
			}
		}
	}
	/**
	 * @param changed
	 */
	private void handleChangedEntries(List changed) {
		Iterator iterator = changed.iterator();
		while (iterator.hasNext()) {
			MarkerEntry entry = (MarkerEntry) iterator.next();
			Iterator iterator2 = markerEntryList.iterator();
			while (iterator2.hasNext()) {
				MarkerEntry oldEntry = (MarkerEntry) iterator2.next();
				if (oldEntry.marker.equals(entry.marker)) {
					iterator2.remove();
				}
			}