title: Column filter lost when updating row data in ag-grid
body: <p>I am trying to pre-configure a column filter in ag-grid, a simple text "equals" filter to show only rows matching some specified text, I have got this working.</p>
  
  <p>However as soon as I replace the model data with a fresh set of rows, my filter disappears.</p>
  
  <p>I have tried updating my model data in 2 ways:</p>
  
  <ul>
  <li>by replacing the value of the bound rowData property (I'm using Vue.js)</li>
  <li>calling api.setRowData(newRows)</li>
  </ul>
  
  <p>Both of these cause the column filter to be lost.</p>
  
  <p>Is there a way to update the model data without losing column filters?</p>