Please describe the problem:
spinbutton value is not updated when using keyboard, not always, but happens.
I created two windows, in the first one there was no problem with getting real
value from spinbutton (there was only a need to set 'focus on click' on a OK
button), but in the second one there were problems getting real value.
I could not switch between widgets using TAB, until I set focus to parent window
and then back to my modal window. I did not find any differences in the code of
these two windows.
when using mouse to change the spinbutton value by clicking on arrows there was
no problem. gtk_spin_button_update must be called before
gtk_spin_button_get_value to get the real value.

Steps to reproduce:
1. create modal window with spinbutton and an OK button
2. change value of spinbutton using keyboard
3. click OK and get the spinbutton value


Actual results:
the value is not the one I enteredin spinbutton entry.

Expected results:
return the real value of spinbutton that I entered.

Does this happen every time?
no

Other information:
no