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
MarkerCategory[] categories = getMarkerAdapter()
							.getCategories();
					if (categories != null) {
						for (int i = 0; i < categories.length; i++) {
							MarkerCategory category = categories[i];
							if (categoriesToExpand.contains(category.getName())) {
								getViewer().expandToLevel(category,
										AbstractTreeViewer.ALL_LEVELS);
							}
						}
					}
					categoriesToExpand.clear();
				}
			}
			return Status.OK_STATUS;
		}
		/**
		 * Add the category to the list of expanded categories.
		 * 
		 * @param category
		 */
		public void addExpandedCategory(MarkerCategory category) {
			categoriesToExpand.add(category.getName());
		}
		/**
		 * Remove the category from the list of expanded ones.
		 * 
		 * @param category
		 */
		public void removeExpandedCategory(MarkerCategory category) {