Number field is half-formatted on input

[pmiklashevych]

https://www.bryntum.com/forum/viewtopic.php?p=82535#p82535

numberField = new NumberField({
    width    : 200,
    appendTo : document.body,
    value    : 1234.549,
    format   : {
        locale   : 'en-US',
        template : '9,999.99'
    }
});

Set cursor before the dot. Type in "123". See "1,234123.54" which is half-formatted. On focus out it gets fully formatted "1,234,123.54".

It's a behavior change resulting from #2127