Formatter: fix for long multiline strings.

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

Index: pkg/analyzer/lib/src/services/writer.dart
diff --git a/pkg/analyzer/lib/src/services/writer.dart b/pkg/analyzer/lib/src/services/writer.dart
index d1437482530c66388d246ac3d3cf1f60f8ce7e20..cf0dd74718aaa05917a1b55124c04cfadd0987a8 100644
--- a/pkg/analyzer/lib/src/services/writer.dart
+++ b/pkg/analyzer/lib/src/services/writer.dart
@@ -350,8 +350,18 @@ class SourceWriter {
     }
   }
 
-  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) {