Bug 129812 [Markers] Enabling problem categorization per default
Build 3.2M5 Recent progress on problem categorization should be made more proeminent by enabling categorization by default. Similar to search view doing hierarchical presentation by default nowadays.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
if (elements[i] instanceof IResource) {
				resourceCollection.add(elements[i]);
			} else {
				addResources(resourceCollection,
						((ResourceMapping) elements[i]));
			}
		}
		IResource[] resources = new IResource[resourceCollection.size()];
		resourceCollection.toArray(resources);
		for (int i = 0; i < markerFilters.length; i++) {
			markerFilters[i].setFocusResource(resources);
		}
	}
	/**
	 * Add the resources for the mapping to resources.
	 * 
	 * @param resources
	 * @param mapping
	 */
	private void addResources(Collection resources, ResourceMapping mapping) {
		try {
			ResourceTraversal[] traversals = mapping.getTraversals(
					ResourceMappingContext.LOCAL_CONTEXT,
					new NullProgressMonitor());
			for (int i = 0; i < traversals.length; i++) {
				ResourceTraversal traversal = traversals[i];
				IResource[] result = traversal.getResources();
				for (int j = 0; j < result.length; j++) {
					resources.add(result[j]);
				}