Fix sidebar when the mouse leave the window

assets/javascripts/views/sidebar/sidebar.coffee

@@ -28,10 +28,14 @@ class app.views.Sidebar extends app.View
 
     app.on 'ready', @onReady
 
-    $.on document.documentElement, 'mouseleave', (event) => @display() unless event.clientX <= 0
+    $.on document.documentElement, 'mouseleave', => @hide()
     $.on document.documentElement, 'mouseenter', => @resetDisplay(forceNoHover: false)
     return
 
+  hide: ->
+    @removeClass 'show'
+    return
+
   display: ->
     @addClass 'show'
     return