improve method invocation and string interpolation suggestions

pkg/analysis_server/lib/src/services/completion/local_computer.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 services.completion.computer.dart.local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element,
     ElementKind;
@@ skipping 212 matching lines @@
   visitPrefixedIdentifier(PrefixedIdentifier node) {
     // InvocationComputer adds suggestions for prefixed elements
     // but this computer adds suggestions for the prefix itself
     SimpleIdentifier prefix = node.prefix;
     if (prefix == null || request.offset <= prefix.end) {
       visitNode(node);
     }
   }
 
   @override
+  visitPropertyAccess(PropertyAccess node) {
+    // InvocationComputer adds suggestions for property access selector
+  }
+
+  @override
+  visitStringInterpolation(StringInterpolation node) {
+    visitNode(node);
+  }
+
+  @override
   visitStringLiteral(StringLiteral node) {
     // ignore
   }
 
   @override
   visitTypeName(TypeName node) {
     // If suggesting completions within a TypeName node
     // then limit suggestions to only types
     typesOnly = true;
     return visitNode(node);
@@ skipping 248 matching lines @@
     if (name == null || name.length <= 0) {
       return DYNAMIC;
     }
     TypeArgumentList typeArgs = type.typeArguments;
     if (typeArgs != null) {
       //TODO (danrubel) include type arguments
     }
     return name;
   }
 }