undo of a completion finished by enter/tab/smart-enter behaves first as if that action was just performed without any completion

java/java-tests/testSrc/com/intellij/codeInsight/completion/JavaAutoPopupTest.groovy

@@ -851,6 +851,28 @@ class LiveComplete {
     assert myFixture.editor.document.text.contains('ArrStoExce.')
   }
 
+  public void testEnterSelectionUndo() {
+    myFixture.configureByText "a.java", "class Foo {{ <caret> }}"
+    def editor = openEditorForUndo();
+    type('ArrStoExce\n')
+
+    edt { UndoManager.getInstance(project).undo(editor) }
+    assert myFixture.editor.document.text.contains('ArrStoExce\n')
+  }
+
+  public void testTabSelectionUndo() {
+    myFixture.configureByText "a.java", "class Foo {{ <caret>x }}"
+    def editor = openEditorForUndo();
+    type('ArrStoExce\t')
+    myFixture.checkResult("class Foo {{ ArrayStoreException<caret> }}")
+
+    edt { UndoManager.getInstance(project).undo(editor) }
+    assert myFixture.editor.document.text.contains('ArrStoExce x')
+
+    edt { UndoManager.getInstance(project).undo(editor) }
+    myFixture.checkResult("class Foo {{ ArrStoExce<caret>x }}")
+  }
+
   public void testAutopopupTypingUndo() {
     myFixture.configureByText "a.java", "class Foo {{ <caret> }}"
     def editor = openEditorForUndo();