Fix incremental scanner's computation of scanEnd.

pkg/analyzer/test/generated/parser_test.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 engine.parser_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/incremental_scanner.dart';
@@ skipping 2672 matching lines @@
   void test_insert_simpleToComplexExression() {
     // "/** An [A]. */ class A {} class B { m() => 1; }"
     // "/** An [A]. */ class A {} class B { m() => 1 + 2; }"
     _assertParse(
         "/** An [A]. */ class A {} class B { m() => 1",
         "",
         " + 2",
         "; }");
   }
 
+  void test_insert_statement_in_method_with_mismatched_braces() {
+    _assertParse('''
+class C {
+  void f() {
+''', '', 'g();', '''
+    if (b) {
+
+
+  }
+
+  void g() {
+    h((x) {});
+  }
+}
+''');
+  }
+
   void test_insert_whitespace_end() {
     // "f() => a + b;"
     // "f() => a + b; "
     _assertParse("f() => a + b;", "", " ", "");
   }
 
   void test_insert_whitespace_end_multiple() {
     // "f() => a + b;"
     // "f() => a + b;  "
     _assertParse("f() => a + b;", "", "  ", "");
@@ skipping 8135 matching lines @@
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser,
         methodName,
         <Object>[tokenStream],
         tokenStream) as Token;
   }
 }