DateTextBox: widget value does not update when textbox loses focus

[mssskhalsa]

When focus shifts from the textbox to the calendar popup the widget value does not update to reflect changes in the textbox.

Steps to reproduce:

1. Open dijit/tests/form/test_DateTextBox.html
2. Test using the widget instance titled "Date, overriding pattern"
3. Click the dropdown button, click on a date
   • The calendar is closed, the selected date is shown in the textbox
4. Click the dropdown button
   • The calendar is open and focused
5. Click the textbox
   • The textbox is focused and has a blinking cursor
6. Type a different year in the textbox
7. Click in the calendar popup on a non-reactive area, e.g. in the header in the empty space between the month selector and the year navigation buttons
   • The texbox is no longer focused; the calendar is focused
8. Expected: the calendar popup should update to reflect the year that was typed in the textbox
   • Result: the calendar popup has not changed at all

[dylan]

Moving 1.12.1 tickets to 1.12.2