🐛 Install WindowEventHandler in ctor

spec/window-event-handler-spec.coffee

@@ -10,6 +10,7 @@ describe "WindowEventHandler", ->
   [projectPath, windowEventHandler] = []
 
   beforeEach ->
+    atom.windowEventHandler.unsubscribe()
     spyOn(atom, 'hide')
     initialPath = atom.project.getPaths()[0]
     spyOn(atom, 'getLoadSettings').andCallFake ->

src/atom-environment.coffee

@@ -194,6 +194,7 @@ class AtomEnvironment extends Model
     @registerDefaultViewProviders()
 
     @installUncaughtErrorHandler()
+    @windowEventHandler = new WindowEventHandler(this)
 
   setConfigSchema: ->
     @config.setSchema null, {type: 'object', properties: _.clone(require('./config-schema'))}
@@ -597,7 +598,6 @@ class AtomEnvironment extends Model
     @setBodyPlatformClass()
 
     document.head.appendChild(@styles.buildStylesElement())
-    @windowEventHandler = new WindowEventHandler(this)
 
     @packages.loadPackages()