Bug 203838 [Markers] [Markers] clicking on column headers does not sort table
I20070918 Clicking on any of the column headers does not sort based on the relevant column.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
newLength = children.length;
				
				if (newLength == currentChildCount)
					return;
				viewer.setChildCount(element, newLength);
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.ILazyTreeContentProvider#updateElement(java.lang.Object,
			 *      int)
			 */
			public void updateElement(Object parent, int index) {
				Object newItem;
				if (parent instanceof MarkerItem)
					newItem = ((MarkerItem) parent).getChildren()[index];
				else
					newItem = ((CachedMarkerBuilder) parent).getElements()[index];
				viewer.replace(parent, index, newItem);
				updateChildCount(newItem, -1);
				if (newItem instanceof MarkerCategory) {
					viewer.expandToLevel(newItem, 1);
				}
			}
		};
	}
	/**
	 * Get the int value for the tag.
	 * 
	 * @param tag