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
* 
	 * @param structuredSelection
	 * @param reveal
	 */
	public void setSelection(IStructuredSelection structuredSelection,
			boolean reveal) {
		TreeViewer viewer = getViewer();
		List newSelection = new ArrayList(structuredSelection.size());
		for (Iterator i = structuredSelection.iterator(); i.hasNext();) {
			Object next = i.next();
			if (next instanceof IMarker) {
				ConcreteMarker marker = getCurrentMarkers().getMarker(
						(IMarker) next);
				if (marker != null) {
					newSelection.add(marker);
				}
			}
		}
		if (viewer != null) {
			viewer.setSelection(new StructuredSelection(newSelection), reveal);
		}
	}
	protected MarkerList getVisibleMarkers() {
		return getCurrentMarkers();
	}
	/**
	 * Returns the total number of markers. Should not be called while the
	 * marker list is still updating.
	 * 
	 * @return the total number of markers in the workspace (including