Bug 114615 [Markers] No feedback for 'Completed' tasks
There's not longer any 'check box' indicator on the Tasks View so clients can't determine whether a task has been completed or not... This is a regression...
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/TaskView.java
if (IMarker.PRIORITY.equals(property))
					return new Integer(IMarker.PRIORITY_HIGH
							- marker.getAttribute(IMarker.PRIORITY,
									IMarker.PRIORITY_NORMAL));
				if (IMarker.MESSAGE.equals(property))
					return marker.getAttribute(IMarker.MESSAGE, ""); 
			}
			return null;
		}
		public boolean canModify(Object element, String property) {
			return Util.isEditable(((ConcreteMarker) element).getMarker());
		}
		public void modify(Object element, String property, Object value) {
			if (element instanceof Item) {
				Item item = (Item) element;
				Object data = item.getData();
				if (data instanceof ConcreteMarker) {
					ConcreteMarker concreteMarker = (ConcreteMarker) data;
					IMarker marker = concreteMarker.getMarker();
					try {
						Object oldValue = getValue(data, property);
						if (oldValue != null && !oldValue.equals(value)) {
							if (COMPLETION.equals(property))
								marker.setAttribute(IMarker.DONE, value);
							else if (IMarker.PRIORITY.equals(property))
								marker.setAttribute(IMarker.PRIORITY,
										IMarker.PRIORITY_HIGH
												- ((Integer) value).intValue());
							else if (IMarker.MESSAGE.equals(property))
								marker.setAttribute(IMarker.MESSAGE, value);