[4.2.2] State provider + summary plugin = Grid with misaligned columns

Code:

Ext.require([
        'Ext.grid.*',
        'Ext.window.Window',
        'Ext.container.Viewport',
        'Ext.layout.container.Border',
        'Ext.state.*',
        'Ext.data.*',
        'Ext.grid.feature.Summary'
    ]);


    Ext.onReady(function(){
        // setup the state provider, all state information will be saved to a cookie
        Ext.state.Manager.setProvider(Ext.create('Ext.state.CookieProvider'));




        Ext.create('Ext.container.Viewport', {
            layout: {
                type: 'border',
                padding: '5'
            },
            items: [{
                region: 'center',
                stateful: true,
                stateId: 'stateGridExample',
                xtype: 'grid',
                features: { ftype: 'summary' },
                store: lesPersonnes,
                columns: [{
                    text: 'First Name',
                    dataIndex: 'first'
                }, {
                    text: 'Last Name',
                    dataIndex: 'last'
                }, {
                    text: 'Age',
                    dataIndex: 'age',
                    hidden: true
                }, {
                    flex: 1,
                    text: 'Review',
                    dataIndex: 'review',
                    hidden: true
                }]
            }]
        });
    });




    var lesPersonnes = Ext.create('Ext.data.Store', {
        model: Ext.define('Person', {
            extend: 'Ext.data.Model',
            fields: ['first', 'last', 'review', {
                name: 'age',
                type: 'int'
            }]
        }),
        data: [{
            first: 'John',
            last: 'Smith',
            age: 32,
            review: 'Solid performance, needs to comment code more!'
        }, {
            first: 'Jane',
            last: 'Brown',
            age: 56,
            review: 'Excellent worker, has written over 100000 lines of code in 3 months. Deserves promotion.'
        }, {
            first: 'Kevin',
            last: 'Jones',
            age: 25,
            review: 'Insists on using one letter variable names for everything, lots of bugs introduced.'
        }, {
            first: 'Will',
            last: 'Zhang',
            age: 41,
            review: 'Average. Works at the pace of a snail but always produces reliable results.'
        }, {
            first: 'Sarah',
            last: 'Carter',
            age: 23,
            review: 'Only a junior, but showing a lot of promise. Coded a Javascript parser in Assembler, very neat.'
        }]
    });