How to prevent UI updates interfering with user's actions?

[Fabian Cenedese]

>I agree that in general one should not update the controls the user is 
>working on (and we might allow such updates to be switched off). On the 
>other hand  it will also be very confusing since the camera itself changes 
>its properties (as it does in auto exposure mode and on some other 
>occasions) without reflecting those changes in the GUI.

The user won't drag forever. So you could just set a modified flag to
know after release that you need to adjust the GUI to the changes
from other places.

bye  Fabi