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/MarkerSupportRegistry.java
removedGroups.add(objects[i]);
			}
			if (objects[i] instanceof MarkerGroupingEntry) {
				MarkerGroupingEntry entry = (MarkerGroupingEntry) objects[i];
				entry.getMarkerGroup().remove(entry);
				markerGroupingEntries.remove(entry.getId());
			}
			if (objects[i] instanceof String) {
				removeValues(objects[i], categories);
			}
		}
		Iterator entriesIterator = markerGroupingEntries.keySet().iterator();
		Collection removedKeys = new ArrayList();
		while (entriesIterator.hasNext()) {
			String entryId = (String) entriesIterator.next();
			MarkerGroupingEntry entry = (MarkerGroupingEntry) markerGroupingEntries
					.get(entryId);
			if (removedGroups.contains(entry.getMarkerGroup())) {
				removedKeys.add(entryId);
			}
		}
		Iterator removedIterator = removedKeys.iterator();
		while (removedIterator.hasNext()) {
			markerGroupingEntries.remove(removedIterator.next());
		}
	}
	/**
	 * Remove the value from all of the collection sets in cache. If the
	 * collection is empty remove the key as well.
	 *