Formatter: fix for long multiline strings.

pkg/analyzer/lib/src/services/writer.dart

 // Copyright (c) 2013, 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 source_writer;
 
 
 
 class Line {
 
@@ skipping 332 matching lines @@
     buffer.write(currentLine.toString());
     currentLine = newLine();
   }
 
   void newlines(int num) {
     while (num-- > 0) {
       newline();
     }
   }
 
-  void write(x) {
-    _addToken(new LineToken(x));
+  void write(String string) {
+    var lines = string.split(lineSeparator);
+    var length = lines.length;
+    for (int i = 0; i < length; i++) {
+      var line = lines[i];
+      _addToken(new LineToken(line));
+      if (i != length - 1) {
+        newline();
+        // no indentation for multi-line strings
+        currentLine.clear();
+      }
+    }
   }
 
   void writeln(String s) {
     write(s);
     newline();
   }
 
   void space() {
     spaces(1);
   }
@@ skipping 71 matching lines @@
 
 String getTabs(int n) => n < TABS.length ? TABS[n] : repeat('\t', n);
 
 String repeat(String ch, int times) {
   var sb = new StringBuffer();
   for (var i = 0; i < times; ++i) {
     sb.write(ch);
   }
   return sb.toString();
 }