title: How to make a widget span multiple columns/rows in gridlayout in kivy
body: <p>I would like to create an app in kivy with widgets in a grid and I want to be able to set some widgets to be larger - to occupy more than one cell in a grid.</p>
  
  <p><code>GridLayout</code> seems the most appropriate, but it seems to not support placing widgets in more than one cell.</p>
  
  <p>To be more specific I want behavour similar to the grid geometry manager from Tkinter, when setting <code>columnspan</code> or <code>rowspan</code> to more than 1.</p>
  
  <p>Like this:</p>
  
  <pre><code>(widget)(widget)(widget)
  ( bigger widget )(widget)
  ...
  </code></pre>
  
  <p>I would prefer to be able to do this using existing kivy layouts instead of having to write my own layout class to handle this, but if no other option is possible, this is also ok.</p>