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/CategorySorter.java
private final String TAG_FIELD = "categoryField"; 
	/**
	 * Create a new instance of the receiver wrapping a sorter.
	 * 
	 * @param sorter
	 */
	CategorySorter(TableSorter sorter) {
		innerSorter = sorter;
	}
	/**
	 * Compare obj1 and obj starting with field depth.
	 * 
	 * @param obj1
	 * @param obj2
	 * @param depth
	 * @param continueSearching
	 * @return int
	 * @see ViewerSorter#compare(Viewer, Object, Object)
	 */
	int compare(Object obj1, Object obj2, int depth, boolean continueSearching) {
		if (obj1 == null || obj2 == null || !(obj1 instanceof MarkerNode)
				|| !(obj2 instanceof MarkerNode)) {
			return 0;
		}
		MarkerNode marker1;
		MarkerNode marker2;
		marker1 = (MarkerNode) obj1;
		marker2 = (MarkerNode) obj2;
		if (categoryField == null) {
			return innerSorter.compare(marker1, marker2, depth,