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
* @param value
	 * @param cache
	 */
	private void removeValues(Object value, HashMap cache) {
		Collection keysToRemove = new ArrayList();
		Iterator keys = cache.keySet().iterator();
		while (keys.hasNext()) {
			String key = (String) keys.next();
			Object next = cache.get(key);
			if (next instanceof Collection) {
				Collection collection = (Collection) next;
				if (collection.contains(value)) {
					collection.remove(value);
					if (collection.isEmpty()) {
						keysToRemove.add(key);
					}
					break;
				}
			} else {
				if (cache.get(key).equals(value)) {
					keysToRemove.add(key);
				}
			}
		}
		Iterator keysToRemoveIterator = keysToRemove.iterator();
		while (keysToRemoveIterator.hasNext()) {
			cache.remove(keysToRemoveIterator.next());
		}
	}
	/**