Don't process disposed editor (the commit is triggered by the reported exception)

platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/EditorHistoryManager.java

@@ -154,7 +154,7 @@ public final class EditorHistoryManager extends AbstractProjectComponent impleme
                                   @Nullable FileEditorProvider fallbackProvider,
                                   final boolean changeEntryOrderOnly)
   {
-    if (file == null){
+    if (file == null) {
       return;
     }
     final FileEditorManagerEx editorManager = FileEditorManagerEx.getInstanceEx(myProject);

platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/text/TextEditorComponent.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2011 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.
@@ -230,7 +230,7 @@ class TextEditorComponent extends JPanel implements DataProvider{
    * @return whether the editor is valid or not
    */
   boolean isEditorValid(){
-    return myValid;
+    return myValid && !myEditor.isDisposed();
   }
 
   /**