Notification example doesn't update on position change

[humdinger]

This is hrev53632.

If you change the width or time sliders, the example notification reflects that change after you let go of the slider knob (btw, it'd be even nicer if the width changed while moving the knob).

The position pop-up doesn't change the example notification's position though, if the example is currently showing. To reproduce, change the position and while the example is showing, change it back.