Reset refactoring manager on any analysis.

pkg/analysis_server/lib/src/edit/edit_domain.dart

Index: pkg/analysis_server/lib/src/edit/edit_domain.dart
diff --git a/pkg/analysis_server/lib/src/edit/edit_domain.dart b/pkg/analysis_server/lib/src/edit/edit_domain.dart
index f912d5163b20a01dbd93c676d3441b877fe8efe7..4f40bbaef26b800d2340432bf63af1c2612697ae 100644
--- a/pkg/analysis_server/lib/src/edit/edit_domain.dart
+++ b/pkg/analysis_server/lib/src/edit/edit_domain.dart
@@ -180,6 +180,8 @@ class _RefactoringManager {
   EditGetRefactoringResult result;
 
   _RefactoringManager(this.server, this.searchEngine) {
+    server.addAnalysisServerListener(
+        new _ResetRefactoringManagerAnalysisServerListener(this));
     _reset();
   }
 
@@ -362,6 +364,9 @@ class _RefactoringManager {
   }
 
   void _reset() {
+    kind = null;
+    offset = null;
+    length = null;
     refactoring = null;
     feedback = null;
     initStatus = new RefactoringStatus();
@@ -426,3 +431,24 @@ class _RefactoringManager {
     return new RefactoringStatus();
   }
 }
+
+
+/**
+ * A [AnalysisServerListener] that resets [_RefactoringManager] when analysis
+ * is started in the [AnalysisServer].
+ */
+class _ResetRefactoringManagerAnalysisServerListener implements
+    AnalysisServerListener {
+  final _RefactoringManager refactoringManager;
+
+  _ResetRefactoringManagerAnalysisServerListener(this.refactoringManager);
+
+  @override
+  void analysisComplete() {
+  }
+
+  @override
+  void analysisStarted(engine.AnalysisContext context) {
+    refactoringManager._reset();
+  }
+}