IDEA-121138 Tab completion does not work in autopopup

java/java-tests/testData/codeInsight/template/postfix/completion/tabCompletionWithTemplatesInAutopopup.java

@@ -0,0 +1,9 @@
+public class Foo {
+    void m() {
+        new MyClass()<caret>
+    }
+  
+    private class MyClass {
+      public void parents() {}
+    }
+}

java/java-tests/testData/codeInsight/template/postfix/completion/tabCompletionWithTemplatesInAutopopup_after.java

@@ -0,0 +1,9 @@
+public class Foo {
+    void m() {
+        new MyClass().parents();<caret>
+    }
+  
+    private class MyClass {
+      public void parents() {}
+    }
+}

java/java-tests/testSrc/com/intellij/codeInsight/template/postfix/completion/TemplatesCompletionTest.java

@@ -143,6 +143,18 @@ public class TemplatesCompletionTest extends CompletionAutoPopupTestCase {
     type("r");
     myFixture.assertPreferredCompletionItems(selectedIndex, ".par", "parents");
   }
+  
+  public void testTabCompletionWithTemplatesInAutopopup() {
+    LiveTemplateCompletionContributor.ourShowTemplatesInTests = true;
+    
+    configureByFile();
+    type(".");
+    myFixture.assertPreferredCompletionItems(0, "parents");
+
+    type("\t");
+    assertNull(getLookup());
+    checkResultByFile();
+  }
 
   @Override
   protected String getBasePath() {

platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/actions/ChooseItemAction.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -112,9 +112,9 @@ public abstract class ChooseItemAction extends EditorAction {
     PsiDocumentManager.getInstance(file.getProject()).commitDocument(editor.getDocument());
 
     final LiveTemplateLookupElement liveTemplateLookup = ContainerUtil.findInstance(lookup.getItems(), LiveTemplateLookupElement.class);
-    if (liveTemplateLookup == null) {
-      // Lookup doesn't contain live templates. It means that 
-      // - there are no any live template:
+    if (liveTemplateLookup == null || !liveTemplateLookup.sudden) {
+      // Lookup doesn't contain sudden live templates. It means that 
+      // - there are no live template with given key:
       //    in this case we should find live template with appropriate prefix (custom live templates doesn't participate in this action). 
       // - completion provider worked too long:
       //    in this case we should check custom templates that provides completion lookup.