Improve import prefix search results UI.

pkg/analysis_server/lib/src/protocol_server.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 protocol.server;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart' as
     engine;
 import 'package:analyzer/src/generated/ast.dart' as engine;
@@ skipping 323 matching lines @@
  */
 SourceEdit newSourceEdit_range(engine.SourceRange range, String replacement,
     {String id}) {
   return new SourceEdit(range.offset, range.length, replacement, id: id);
 }
 
 List<Element> _computePath(engine.Element element) {
   List<Element> path = <Element>[];
   while (element != null) {
     path.add(newElement_fromEngine(element));
-    element = element.enclosingElement;
+    // go up
+    if (element is engine.PrefixElement) {
+      // imports are library children, but they are physically in the unit
+      engine.LibraryElement library = element.enclosingElement;
+      element = library.definingCompilationUnit;
+    } else {
+      element = element.enclosingElement;
+    }
   }
   return path;
 }
 
 
 String _getParametersString(engine.Element element) {
   // TODO(scheglov) expose the corresponding feature from ExecutableElement
   if (element is engine.ExecutableElement) {
     var sb = new StringBuffer();
     String closeOptionalString = '';
@@ skipping 93 matching lines @@
       startColumn = offsetLocation.columnNumber;
     }
   }
   return new Location(
       source.fullName,
       range.offset,
       range.length,
       startLine,
       startColumn);
 }