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
* 
			 * @see org.eclipse.swt.events.TreeAdapter#treeCollapsed(org.eclipse.swt.events.TreeEvent)
			 */
			public void treeCollapsed(TreeEvent e) {
				updateJob.removeExpandedCategory((MarkerCategory) e.item
						.getData());
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.swt.events.TreeAdapter#treeExpanded(org.eclipse.swt.events.TreeEvent)
			 */
			public void treeExpanded(TreeEvent e) {
				updateJob
						.addExpandedCategory((MarkerCategory) e.item.getData());
			}
		});
		return tree;
	}
	/**
	 * The focus elements have changed. Update accordingly.
	 */
	private void refreshForFocusUpdate() {
		if (focusElements != null) {
			updateFilterSelection(focusElements);
			refreshViewer();
		}
	}
}