Issue 27133. Reset AnalysisDriver when performing limited invalidation.

pkg/analyzer/lib/src/context/context.dart

 // Copyright (c) 2015, 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.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1838 matching lines @@
       for (CacheEntry entry in _entriesFor(source)) {
         entry.modificationTime = time;
       }
     }
 
     // Fast path if the contents is the same as it was last time.
     if (oldContents != null && fileContents?.data == oldContents) {
       return;
     }
 
+    // We're going to update the cache, so reset the driver.
+    driver.reset();
+
     // We need to invalidate the cache.
     {
       if (analysisOptions.finerGrainedInvalidation &&
           AnalysisEngine.isDartFileName(source.fullName)) {
         // TODO(scheglov) Incorrect implementation in general.
         entry.setState(TOKEN_STREAM, CacheState.FLUSHED);
         entry.setState(PARSED_UNIT, CacheState.FLUSHED);
         SourceKind sourceKind = getKindOf(source);
         List<Source> partSources = getResult(source, INCLUDED_PARTS);
         if (sourceKind == SourceKind.LIBRARY && partSources.isEmpty) {
@@ skipping 22 matching lines @@
               entry.setState(CONTENT, CacheState.INVALID, delta: dartDelta);
               return;
             }
           }
         }
       }
       entry.setState(CONTENT, CacheState.INVALID);
       entry.setState(MODIFICATION_TIME, CacheState.INVALID);
       entry.setState(SOURCE_KIND, CacheState.INVALID);
     }
-    driver.reset();
     for (WorkManager workManager in workManagers) {
       workManager.applyChange(
           Source.EMPTY_LIST, <Source>[source], Source.EMPTY_LIST);
     }
   }
 
   /**
    * Record that the give [source] has been deleted.
    */
   void _sourceDeleted(Source source) {
@@ skipping 384 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }