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/BookmarkView.java
import org.eclipse.ui.internal.ide.IDEInternalPreferences;
import org.eclipse.ui.part.CellEditorActionHandler;
import org.eclipse.ui.plugin.AbstractUIPlugin;
/**
 * The BookmarkView is the marker view for bookmarks.
 *
 */
public class BookmarkView extends MarkerView {
	private final ColumnPixelData[] DEFAULT_COLUMN_LAYOUTS = {
			new ColumnPixelData(200), new ColumnPixelData(75),
			new ColumnPixelData(150), new ColumnPixelData(60) };
	private final IField[] HIDDEN_FIELDS = { new FieldCreationTime() };
	private final static String[] ROOT_TYPES = { IMarker.BOOKMARK };
	private final static String[] TABLE_COLUMN_PROPERTIES = { IMarker.MESSAGE,
			"", 
			"", 
			"" 
	};
	private final static String TAG_DIALOG_SECTION = "org.eclipse.ui.views.bookmark"; 
	private final IField[] VISIBLE_FIELDS = { new FieldMessage(),
			new FieldResource(), new FieldFolder(), new FieldLineNumber() };
	private ICellModifier cellModifier = new ICellModifier() {
		public Object getValue(Object element, String property) {
			if (element instanceof ConcreteMarker
					&& IMarker.MESSAGE.equals(property))
				return ((ConcreteMarker) element).getDescription();
			else
				return null;
		}
		public boolean canModify(Object element, String property) {