2 files changed, 18 insertions, 6 deletions
diff --git a/components/autocomplete/nsAutoCompleteController.cpp b/components/autocomplete/nsAutoCompleteController.cpp
index 37b2e5dfa..971a7abaf 100644
--- a/components/autocomplete/nsAutoCompleteController.cpp
+++ b/components/autocomplete/nsAutoCompleteController.cpp
@@ -1160,11 +1160,16 @@ nsAutoCompleteController::BeforeSearches()
   mSearchStatus = nsIAutoCompleteController::STATUS_SEARCHING;
   mDefaultIndexCompleted = false;
 
-  // The first search result will clear mResults array, though we should pass
-  // the previous result to each search to allow them to reuse it.  So we
-  // temporarily cache current results till AfterSearches().
-  if (!mResultCache.AppendObjects(mResults)) {
-    return NS_ERROR_OUT_OF_MEMORY;
+  bool invalidatePreviousResult = false;
+  mInput->GetInvalidatePreviousResult(&invalidatePreviousResult);
+
+  if (!invalidatePreviousResult) {
+    // ClearResults will clear the mResults array, but we should pass the
+    // previous result to each search to allow reusing it.  So we temporarily
+    // cache the current results until AfterSearches().
+    if (!mResultCache.AppendObjects(mResults)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
   }
 
   mSearchesOngoing = mSearches.Length();
diff --git a/components/autocomplete/nsIAutoCompleteInput.idl b/components/autocomplete/nsIAutoCompleteInput.idl
index 26a75ea77..98f36d11b 100644
--- a/components/autocomplete/nsIAutoCompleteInput.idl
+++ b/components/autocomplete/nsIAutoCompleteInput.idl
@@ -7,7 +7,7 @@
 
 interface nsIAutoCompletePopup;
 
-[scriptable, uuid(B068E70F-F82C-4C12-AD87-82E271C5C180)]
+[scriptable, uuid(224d9847-d743-47e3-8c9e-07e1bcedf569)]
 interface nsIAutoCompleteInput : nsISupports
 {
   /*
@@ -178,4 +178,11 @@ interface nsIAutoCompleteInput : nsISupports
    * The userContextId of the current browser.
    */
   readonly attribute unsigned long userContextId;
+
+  /**
+   * Indicates whether the previous result should be invalidated due to dynamic
+   * list updates. If search content is updated, we shouldn't use the previous
+   * search result.
+   */
+  readonly attribute boolean invalidatePreviousResult;
 };