title: JqGrid not highlight error when editing validation fails
body: <p>I use inline edit mode with some editrules (editrules:{number:true} for example).</p>
  
  <p>When I save, if the validation fails the errror message box appeart correctly but the faultly field is not highlighted in red (class ui-state-error).</p>
  
  <p>By default, should not jqgrid added the class "ui-state-error" ?</p>
  
  <pre><code>grid.jqGrid({
      datatype: 'local',
      data: colD.rootVar,
      gridview: true,
      colModel : [
          {name: "Team", label:"team", index:"team", width:"150", align:"center", sortable:false},
          {name:"Employee", index:"employee", width:"150", align:"center", sortable:false},
          {name:"col_01", index:"1", width:"50", align:"center", sortable:false, editable:true, editrules:{required: true, number:true} },
          {name:"col_02", index:"2", width:"50", align:"center", sortable:false, editable:true } ],
      pager: jQuery('#pager'),
      rowNum: 20,
      rowList: [5, 10, 20, 50],
      height: "auto",
      viewrecords: true,
      caption: "Planning Management ITEC-PRD"
      });
  
      grid.jqGrid('navGrid',"#pager",{edit:false, add:false, del:false});
      grid.jqGrid('inlineNav',"#pager",{edit:true, add:false, del:false});
  }
  </code></pre>
  
  <p>Thx for your help</p>