Tweaks for hover.

pkg/analyzer/lib/src/generated/element.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 796 matching lines @@
    */
   void set validMixin(bool isValidMixin) {
     setModifier(Modifier.MIXIN, isValidMixin);
   }
 
   @override
   accept(ElementVisitor visitor) => visitor.visitClassElement(this);
 
   @override
   void appendTo(StringBuffer buffer) {
+    if (isAbstract) {
+      buffer.write('abstract ');
+    }
+    buffer.write('class ');
     String name = displayName;
     if (name == null) {
       buffer.write("{unnamed class}");
     } else {
       buffer.write(name);
     }
     int variableCount = _typeParameters.length;
     if (variableCount > 0) {
       buffer.write("<");
       for (int i = 0; i < variableCount; i++) {
         if (i > 0) {
           buffer.write(", ");
         }
         (_typeParameters[i] as TypeParameterElementImpl).appendTo(buffer);
       }
       buffer.write(">");
     }
+    if (supertype != null && !supertype.isObject) {
+      buffer.write(' extends ');
+      buffer.write(supertype.displayName);
+    }
+    if (mixins.isNotEmpty) {
+      buffer.write(' with ');
+      buffer.write(mixins.map((t) => t.displayName).join(', '));
+    }
+    if (interfaces.isNotEmpty) {
+      buffer.write(' implements ');
+      buffer.write(interfaces.map((t) => t.displayName).join(', '));
+    }
   }
 
   @override
   NamedCompilationUnitMember computeNode() {
     if (isEnum) {
       return getNodeMatching((node) => node is EnumDeclaration);
     } else {
       return getNodeMatching(
           (node) => node is ClassDeclaration || node is ClassTypeAlias);
     }
@@ skipping 9970 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }