Bug 258810 [Markers] Markers for the entire workspace show up when working set empty
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerContentGenerator.java
}
	/**
	 * Re-generate all of the markers and filter them based on the enabled
	 * filters.
	 * 
	 * @param subMonitor
	 * @param andFilters
	 *            if <code>true</code> return the intersection of the filters
	 * @param focusResources
	 *            the current selected resources
	 * @param enabledFilters
	 *            the enabled {@link MarkerFieldFilterGroup}s to apply
	 * @return MarkerMap
	 */
	MarkerMap generateFilteredMarkers(SubProgressMonitor subMonitor,
			boolean andFilters, IResource[] focusResources,
			Collection enabledFilters) {
		Collection returnMarkers = null;
		if (enabledFilters.size() > 0) {
			Iterator filtersIterator = enabledFilters.iterator();
			if (andFilters) {
				Collection matching = new HashSet();
				while (filtersIterator.hasNext()) {
					computeMarkers(matching, subMonitor,
							(MarkerFieldFilterGroup) filtersIterator.next(),
							focusResources);
					if (returnMarkers == null)
						returnMarkers = new HashSet(matching);
					else
						findIntersection(matching, returnMarkers);