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/MarkerFieldFilterGroup.java
/**
	 * Return all of the paths in the working set
	 * 
	 * @return Collection
	 */
	private Collection getWorkingSetPaths() {
		if (workingSetPaths == null) {
			workingSetPaths = new HashSet();
			addResourcesAndChildrenPaths(getResourcesInWorkingSet());
		}
		return workingSetPaths;
	}
	
	/**
	 * Gather the resource is in the working set
	 */
	private void computeWorkingSetResources() {
		if(workingSet!=null){
			 /* MarkerFieldFilterGroup will have to re-get the resources in 
			 * a working set for every marker it filters using the select method
			 * Or we may do this once before the markers are filtered.A IResourceChangeListener??		 
			 */
			wSetResources=getResourcesInWorkingSet();
		}
	}
	/**
	 * Return true if the resource is in the working set
	 * @param resource
	 * @return boolean
	 */