From 93de5ccb79c4972e55bb7bf1edc241f8525ad8e9 Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Mon, 12 Oct 2015 15:32:36 -0600
Subject: [PATCH] Assign window.onbeforeunload instead of addEventListener
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This allows us to cancel the unloading if the user doesn’t confirm the
save dialog.
---
 src/window-event-handler.coffee | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/window-event-handler.coffee b/src/window-event-handler.coffee
index 270650b2f..53c2aa2e2 100644
--- a/src/window-event-handler.coffee
+++ b/src/window-event-handler.coffee
@@ -16,9 +16,10 @@ class WindowEventHandler
     @on(ipc, 'command', @handleIPCCommand)
     @on(ipc, 'context-command', @handleIPCContextCommand)
 
+    @previousOnbeforeunloadHandler = window.onbeforeunload
+    window.onbeforeunload = @handleWindowBeforeunload
     @addEventListener(window, 'focus', @handleWindowFocus)
     @addEventListener(window, 'blur', @handleWindowBlur)
-    @addEventListener(window, 'beforeunload', @handleWindowBeforeunload)
     @addEventListener(window, 'unload', @handleWindowUnload)
 
     @addEventListener(document, 'keydown', @handleDocumentKeydown)
@@ -60,6 +61,7 @@ class WindowEventHandler
     bindCommandToAction('core:cut', 'cut')
 
   unsubscribe: ->
+    window.onbeforeunload = @previousOnbeforeunloadHandler
     @subscriptions.dispose()
 
   on: (target, eventName, handler) ->