Editor updates lines when it is resized

src/app/editor.coffee

@@ -210,6 +210,9 @@ class Editor extends View
       else
         @gutter.addClass('drop-shadow')
 
+    $(window).on "resize", =>
+      @updateLines()
+
   afterAttach: (onDom) ->
     return if @attached or not onDom
     @attached = true