Fix missing annotations in script inset when first annotation is outside the subset of lines being …

runtime/observatory/lib/src/elements/script_inset.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 script_inset_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'service_ref.dart';
@@ skipping 398 matching lines @@
       }
     }
 
     return table;
   }
 
   // Assumes annotations are sorted.
   Annotation nextAnnotationOnLine(int line) {
     if (annotationsCursor >= annotations.length) return null;
     var annotation = annotations[annotationsCursor];
+
+    // Fast-forward past any annotations before the first line that
+    // we are displaying.
+    while (annotation.line < line) {
+      annotationsCursor++;
+      if (annotationsCursor >= annotations.length) return null;
+      annotation = annotations[annotationsCursor];
+    }
+
+    // Next annotation is for a later line, don't advance past it.
     if (annotation.line != line) return null;
     annotationsCursor++;
     return annotation;
   }
 
   Element lineElement(ScriptLine line) {
     var e = new DivElement();
     e.classes.add("sourceRow");
     e.append(lineBreakpointElement(line));
     e.append(lineNumberElement(line));
@@ skipping 108 matching lines @@
         annotation.applyStyleTo(consumeUntil(annotation.columnStop));
       }
       consumeUntil(line.text.length);
     }
 
     return e;
   }
 
   ScriptInsetElement.created() : super.created();
 }