Issue 29960. Both CommandLineOptions and AnalysisOptions must be equal to reuse the context.

pkg/analyzer/lib/src/generated/engine.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 analyzer.src.generated.engine;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:typed_data';
 
@@ skipping 1689 matching lines @@
     enableLazyAssignmentOperators = options.enableLazyAssignmentOperators;
     enableStrictCallChecks = options.enableStrictCallChecks;
     enableSuperMixins = options.enableSuperMixins;
     strongMode = options.strongMode;
     if (options is AnalysisOptionsImpl) {
       strongModeHints = options.strongModeHints;
     }
   }
 
   /**
+   * Return whether the given lists of lints are equal.
+   */
+  static bool compareLints(List<Linter> a, List<Linter> b) {
+    if (a.length != b.length) {
+      return false;
+    }
+    for (int i = 0; i < a.length; i++) {
+      if (a[i].lintCode != b[i].lintCode) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
    * Predicate used for [analyzeFunctionBodiesPredicate] when
    * [analyzeFunctionBodies] is set to `true`.
    */
   static bool _analyzeAllFunctionBodies(Source _) => true;
 
   /**
    * Predicate used for [analyzeFunctionBodiesPredicate] when
    * [analyzeFunctionBodies] is set to `false`.
    */
   static bool _analyzeNoFunctionBodies(Source _) => false;
@@ skipping 1141 matching lines @@
    */
   bool get wereSourcesAdded => _changeSet.addedSources.length > 0;
 
   /**
    * Return `true` if any sources were removed or deleted.
    */
   bool get wereSourcesRemoved =>
       _changeSet.removedSources.length > 0 ||
       _changeSet.removedContainers.length > 0;
 }