CloseWindow action is totally unnecessary. It is only bound in Emacs keymap (to esc+esc), which works anyway thanks to DialogWrapper local shortcut bindings.

platform/platform-impl/src/com/intellij/ide/actions/CloseWindowAction.java

@@ -1,68 +0,0 @@
-/*
- * Copyright 2000-2009 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.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.intellij.ide.actions;
-
-import com.intellij.openapi.actionSystem.AnAction;
-import com.intellij.openapi.actionSystem.AnActionEvent;
-import com.intellij.openapi.wm.impl.IdeFrameImpl;
-import com.intellij.openapi.project.DumbAware;
-
-import java.awt.*;
-import java.awt.event.WindowEvent;
-
-/**
- * @author Vladimir Kondratyev
- */
-public class CloseWindowAction extends AnAction implements DumbAware {
-  public CloseWindowAction(){
-    setEnabledInModalContext(true);
-  }
-
-  private static Window getWindow(){
-    Window focusedWindow=KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusedWindow();
-    if(!(focusedWindow instanceof Dialog) && !(focusedWindow instanceof Frame)){
-      return null;
-    }
-    if(focusedWindow instanceof Dialog){
-      Dialog dialog=(Dialog)focusedWindow;
-      if(!dialog.isUndecorated()){
-        return focusedWindow;
-      }else{
-        return null;
-      }
-    }else if(!(focusedWindow instanceof IdeFrameImpl)){
-      Frame frame=(Frame)focusedWindow;
-      if(!frame.isUndecorated()){
-        return focusedWindow;
-      }else{
-        return null;
-      }
-    }else{
-      return null;
-    }
-  }
-
-  public void actionPerformed(AnActionEvent e){
-    Window window=getWindow();
-    WindowEvent event=new WindowEvent(window,WindowEvent.WINDOW_CLOSING);
-    window.dispatchEvent(event);
-  }
-
-  public void update(AnActionEvent e){
-    super.update(e);
-    e.getPresentation().setEnabled(getWindow()!=null);
-  }
-}

platform/platform-resources/src/idea/Keymap_Default.xml

@@ -828,7 +828,6 @@
   <action id="Refresh">
     <keyboard-shortcut first-keystroke="control F5"/>
   </action>
-  <action id="CloseWindow"/>
   <action id="Rerun">
     <keyboard-shortcut first-keystroke="control F5"/>
   </action>

platform/platform-resources/src/idea/Keymap_Eclipse.xml

@@ -30,7 +30,6 @@
       <keyboard-shortcut first-keystroke="shift control W" />
     </action>
     <action id="CloseEditor" />
-    <action id="CloseWindow" />
     <action id="CodeInspection.OnEditor" />
     <action id="CollapseAllRegions">
       <keyboard-shortcut first-keystroke="shift control DIVIDE" />

platform/platform-resources/src/idea/Keymap_Emacs.xml

@@ -1,8 +1,5 @@
 <component>
   <keymap name="Emacs" parent="$default" version="1" disable-mnemonics="false">
-    <action id="CloseWindow">
-      <keyboard-shortcut first-keystroke="ESCAPE" second-keystroke="ESCAPE"/>
-    </action>
     <action id="EditorEscape">
       <keyboard-shortcut first-keystroke="ESCAPE" second-keystroke="ESCAPE"/>
     </action>

platform/platform-resources/src/idea/Keymap_Mac.xml

@@ -233,7 +233,6 @@
       <keyboard-shortcut first-keystroke="END"/>
       <keyboard-shortcut first-keystroke="meta RIGHT"/>
     </action>
-    <action id="CloseWindow"/>
     <action id="Exit">
       <keyboard-shortcut first-keystroke="meta Q"/>
     </action>

platform/platform-resources/src/idea/Keymap_MacClassic.xml

@@ -237,7 +237,6 @@
       <keyboard-shortcut first-keystroke="END"/>
       <keyboard-shortcut first-keystroke="meta RIGHT"/>
     </action>
-    <action id="CloseWindow"/>
     <action id="Exit">
       <keyboard-shortcut first-keystroke="meta Q"/>
     </action>

platform/platform-resources/src/idea/Keymap_Netbeans.xml

@@ -51,7 +51,6 @@
       <keyboard-shortcut first-keystroke="control F4" />
       <keyboard-shortcut first-keystroke="control W" />
     </action>
-    <action id="CloseWindow" />
     <action id="CodeCompletion">
       <keyboard-shortcut first-keystroke="control SPACE" />
       <keyboard-shortcut first-keystroke="control BACK_SLASH" />

platform/platform-resources/src/idea/PlatformActions.xml

@@ -12,7 +12,6 @@
     <action id="ContextHelp" class="com.intellij.ide.actions.ContextHelpAction"/>
     <action id="RunGc" class="com.intellij.ide.actions.RunGcAction"/>
     <action id="ShowPopupMenu" class="com.intellij.ide.actions.ShowPopupMenuAction"/>
-    <action id="CloseWindow" class="com.intellij.ide.actions.CloseWindowAction"/>
 
     <action id="NextEditorTab" class="com.intellij.openapi.fileEditor.impl.SelectNextEditorTabAction"/>
     <action id="PreviousEditorTab" class="com.intellij.openapi.fileEditor.impl.SelectPreviousEditorTabAction"/>