Fix for subscribing for notifications for files in packages.

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 8af64b3f40d93bef9ec327223660860c200bfc75..5debcd222f1d6ef6e08d3b77c2f3b1a768cc03c1 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -612,6 +612,9 @@ abstract class ContextManager {
     if (context == null) {
       return source;
     }
+    if (context.sourceFactory == null) {

[Brian Wilkerson, 2015/03/06 15:04:27]

This should never happen. We should minimally write a message to the log so that
we know how often it's happening.

[scheglov, 2015/03/06 22:10:34]

Done.

You're right, it shouldn't.
I found it running tests, not all of the AnalysisContexts had SourceFactory set.
But now we don't need this check.

+      return null;
+    }
     Uri uri = context.sourceFactory.restoreUri(source);
     return file.createSource(uri);
   }