title: Extjs datefield looks weird in my grid
body: <p>I wrote simple grid with one datecolumn using ExtJs 6.2.0,
  but it doesnt' looks well. I mean datepicker is so narrow and weird-looking.</p>
  
  <pre><code>    xtype: 'gridpanel',
      reference: 'payordFlowGrid',
      width: 1000,
      minHeight: 120,
      margin: '0 0 10 0',
      requires: [
          'Ext.selection.CellModel',
          'Ext.grid.column.Action'
      ],
      plugins: {
          ptype: 'cellediting',
          clicksToEdit: 1,
          listeners: {
              beforeedit: function(editor, context, eOpts){
                  // workaround for error at clicking a widgetcolumn
                  if (context.column.widget)
                      return false;
              }
          }
      },
      bind: {
          store: '{payordflowstore}'
      },
      actions: {
          del: {
              glyph: 'xf147@FontAwesome',
              tooltip: 'Del',
              handler: 'onGridPayordFlowDel'
          }
      },
      columns: [
          ...
          { text: '№ п.п.',  dataIndex: 'npp', width: 100,
              editor: {
                  allowBlank: true
              }
          },
          { xtype: 'datecolumn',
              header: 'Дата',
              dataIndex: 'dt',
  
              width: 95,
              format: 'd m Y',
              editor: {
                  xtype: 'datefield',
                  format: 'd.m.y'
              }
          },
          { text: 'Расчет.сумма',  dataIndex: 'summa6', width: 100
          },
          { xtype: 'checkcolumn', text: 'Подпись', dataIndex: 'signed' }
          ,
           {
              menuDisabled: true,
              sortable: false,
              xtype: 'actioncolumn',
              width: 50,
              items: ['@del']
          }
      ]
  }
  </code></pre>
  
  <p>Now my question:
  Why is my date picker looks so weird:
  <a href="https://i.stack.imgur.com/9uCof.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9uCof.png" alt="enter image description here"></a></p>
  
  <p>But I saw sencha sample from <a href="http://examples.sencha.com/extjs/6.2.0/examples/kitchensink/#cell-editing" rel="nofollow noreferrer">there</a>, that looks great:
  <a href="https://i.stack.imgur.com/c2HIJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c2HIJ.png" alt="enter image description here"></a></p>