fix #826 Input widgets displayed value jumps

Will fix the following input widgets:

- [TextWidget](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/textfield/binding "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/textfield/binding")
- [DatePicker](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/datepicker/customized "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/datepicker/customized")
- [TimeField](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/timefield "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/timefield")
- [NumberField](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/numberfield "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/numberfield")
- [DateField](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/datefield "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/datefield")
- [MultiSelect](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/multiselect "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/multiselect")
- [AutoComplete](http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/autocomplete/basic "http://snippets.ariatemplates.com/samples/github.com/ariatemplates/documentation-code/tree/master/samples/widgets/autocomplete/basic")