Formatter: don't indent EOL comment at the beginning of a line.

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

Index: pkg/analyzer/lib/src/services/formatter_impl.dart
diff --git a/pkg/analyzer/lib/src/services/formatter_impl.dart b/pkg/analyzer/lib/src/services/formatter_impl.dart
index cfa81c9548c6d7ba4e0686d374724bceb2afb805..6998a192f97815273123532db5445b7875f47143 100644
--- a/pkg/analyzer/lib/src/services/formatter_impl.dart
+++ b/pkg/analyzer/lib/src/services/formatter_impl.dart
@@ -1686,6 +1686,10 @@ class SourceVisitor implements AstVisitor {
   }
 
 
+  /// Test if this EOL [comment] is at the beginning of a line.
+  bool isAtBOL(Token comment) =>
+      lineInfo.getLocation(comment.offset).columnNumber == 1;
+
   /// Test if this [comment] is at the end of a line.
   bool isAtEOL(Token comment) =>
       comment != null && comment.toString().trim().startsWith(twoSlashes) &&
@@ -1701,6 +1705,11 @@ class SourceVisitor implements AstVisitor {
       }
     }
 
+    // Don't indent commented-out lines
+    if (isAtBOL(comment)) {
+      writer.currentLine.clear();
+    }
+
     append(comment.toString().trim());
   }