#2 date field : range of years is not updated with new value

[Dieter Adriaenssens]

In case of a input_date_field and input_datetime_field :
When a new value is set (or default is reset), the range of years in the dropdown box is not updated.
The normal range is current year of the value +/- 10 years, but if the new value is more than 10 years before or after the initial value, it is not shown in the dropdown box.