Don't allow inline block comments to eat pending newlines.

lib/src/whitespace.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 dart_style.src.whitespace;
 
 /// The kind of pending whitespace that has been "written", but not actually
 /// physically output yet.
 ///
 /// We defer actually writing whitespace until a non-whitespace token is
 /// encountered to avoid trailing whitespace.
 class Whitespace {
+  /// No whitespace.
+  static const none = const Whitespace._("none");
+
   /// A single non-breaking space.
   static const space = const Whitespace._("space");
 
   /// A single newline.
   static const newline = const Whitespace._("newline");
 
   /// A single newline that takes into account the current expression nesting
   /// for the next line.
   static const nestedNewline = const Whitespace._("nestedNewline");
 
@@ skipping 15 matching lines @@
 
   /// One or two newlines should be output based on how many newlines are
   /// present between the next token and the previous one.
   ///
   /// In general, we like to avoid using this because it makes the formatter
   /// less prescriptive over the user's whitespace.
   static const oneOrTwoNewlines = const Whitespace._("oneOrTwoNewlines");
 
   final String name;
 
+  /// Gets the minimum number of newlines contained in this whitespace.
+  int get minimumLines {
+    switch (this) {
+      case Whitespace.newline:
+      case Whitespace.nestedNewline:
+      case Whitespace.newlineFlushLeft:
+      case Whitespace.oneOrTwoNewlines:
+        return 1;
+
+      case Whitespace.twoNewlines:
+        return 2;
+
+      default:
+        return 0;
+    }
+  }
+
   const Whitespace._(this.name);
 
   String toString() => name;
 }