old_contents: /**
   * The store used for summits
   */
  Ext.define('CF.store.Activity', {
    extend: 'Ext.data.Store',
    requires: [
      'Ext.grid.*',
      'Ext.data.*',
      'Ext.util.*',
      'Ext.grid.plugin.BufferedRenderer',
      'CF.model.Activity'
    ],
  
    model: 'CF.model.Activity',
    alias: 'store.activity',
    storeId: 'activityStore',
  
    // allow the grid to interact with the paging scroller by buffering
    buffered: true,
    leadingBufferZone: 30,
    pageSize: 300
  });
new_contents: /**
   * The store used for summits
   */
  Ext.define('CF.store.Activity', {
    extend: 'Ext.data.BufferedStore',
    requires: [
      'Ext.grid.*',
      'Ext.data.*',
      'Ext.util.*',
      'Ext.grid.plugin.BufferedRenderer',
      'CF.model.Activity'
    ],
  
    model: 'CF.model.Activity',
    alias: 'store.activity',
    storeId: 'activityStore',
  
    leadingBufferZone: 300,
    pageSize: 100
  });
subject: Fix infinite scroll