Fix issue where errors aren't reported for a new overlay

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 77c8d88f19111919b0c5007eafc80257e6ccea0c..2b509da14c522bf54880d519fb1cc84a042b01db 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -551,7 +551,8 @@ class AnalysisServer {
       if (containingContext != null) {
         Source source =
             ContextManagerImpl.createSourceInContext(containingContext, file);
-        return new ContextSourcePair(containingContext, source);
+        return new ContextSourcePair(containingContext, source,
+            contained: true);
       }
     }
     // try to find a context that analysed the file
@@ -1262,7 +1263,8 @@ class AnalysisServer {
         sources.forEach((Source source) {
           anyContextUpdated = true;
           if (context.handleContentsChanged(
-              source, oldContents, newContents, true)) {
+              source, oldContents, newContents, true,
+              explicit: contextSource.contained)) {

[skybrian, 2016/03/02 06:35:34]

Oops, this check should probably be something like:
  contextSource.context == context && contextSource.contained

             schedulePerformAnalysisOperation(context);
           } else {
             // When the client sends any change for a source, we should resend
@@ -1440,7 +1442,13 @@ class ContextSourcePair {
    */
   final Source source;
 
-  ContextSourcePair(this.context, this.source);
+  /**
+   * If true, the source is contained within the directory associated
+   * with the context.
+   */
+  final bool contained;
+
+  ContextSourcePair(this.context, this.source, {this.contained: false});
 }
 
 /**