Issue 21552. Fixes for navigation, hover and rename in instance creation expressions.

pkg/analysis_server/lib/src/computer/computer_hover.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 computer.hover;
 
 import 'package:analysis_server/src/protocol.dart' show HoverInformation;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 
@@ skipping 50 matching lines @@
   final CompilationUnit _unit;
   final int _offset;
 
   DartUnitHoverComputer(this._unit, this._offset);
 
   /**
    * Returns the computed hover, maybe `null`.
    */
   HoverInformation compute() {
     AstNode node = new NodeLocator.con1(_offset).searchWithin(_unit);
+    if (node.parent is TypeName &&
+        node.parent.parent is ConstructorName &&
+        node.parent.parent.parent is InstanceCreationExpression) {
+      node = node.parent.parent.parent;
+    }
+    if (node.parent is ConstructorName &&
+        node.parent.parent is InstanceCreationExpression) {
+      node = node.parent.parent;
+    }
     if (node is Expression) {
-      HoverInformation hover = new HoverInformation(node.offset, node.length);
+      Expression expression = node;
+      HoverInformation hover =
+          new HoverInformation(expression.offset, expression.length);
       // element
-      Element element = ElementLocator.locateWithOffset(node, _offset);
+      Element element = ElementLocator.locateWithOffset(expression, _offset);
       if (element != null) {
         // variable, if synthetic accessor
         if (element is PropertyAccessorElement) {
           PropertyAccessorElement accessor = element;
           if (accessor.isSynthetic) {
             element = accessor.variable;
           }
         }
         // description
         hover.elementDescription = element.toString();
         hover.elementKind = element.kind.displayName;
         // library
         LibraryElement library = element.library;
         if (library != null) {
           hover.containingLibraryName = library.name;
           hover.containingLibraryPath = library.source.fullName;
         }
         // documentation
         String dartDoc = element.computeDocumentationComment();
         dartDoc = _removeDartDocDelimiters(dartDoc);
         hover.dartdoc = dartDoc;
       }
       // parameter
-      hover.parameter = _safeToString(node.bestParameterElement);
+      hover.parameter = _safeToString(expression.bestParameterElement);
       // types
-      hover.staticType = _safeToString(node.staticType);
-      hover.propagatedType = _safeToString(node.propagatedType);
+      hover.staticType = _safeToString(expression.staticType);
+      hover.propagatedType = _safeToString(expression.propagatedType);
       // done
       return hover;
     }
     // not an expression
     return null;
   }
 
   static _safeToString(obj) => obj != null ? obj.toString() : null;
 }