title: kivy box layout spacing not working in .kv file
body: <p>I wrote a simple kivy app that show a root widget with 3 buttons vertically , with some padding and spacing between the buttons , when i use kivy BoxLayout spacing in the same python script it works perfectly , but when try to do the same thing using .kv file , only padding works , the spacing doesn't work .</p>
  <p>here is the code :</p>
  <p>main script :</p>
  <pre><code>import kivy
  from kivy.app import App
  from kivy.uix.widget import Widget
  from kivy.lang import Builder
  kivy.require('2.0.0')
  
  Builder.load_file('temp001.kv')
  
  class Root(Widget):
      pass
  
  
  class Main(App):
      def build(self):
          return Root()
          
  if __name__ == '__main__':
      Main().run()
  </code></pre>
  <p>The .kv file code :</p>
  <pre><code>&lt;Root&gt;
     BoxLayout:
         orientation:&quot;vertical&quot;
         size: root.width, root.height
         sapcing: 50
         padding: 100
         
         Button:
             text: &quot;hello&quot;
             
         Button:
             text: &quot;hey&quot;
             
         Button:
             text: &quot;wow&quot;
  
  </code></pre>
  <p>The Result :
  <a href="https://i.stack.imgur.com/xW2bq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xW2bq.png" alt="enter image description here" /></a></p>