Shrinking gap when closing an alert

[ilyai]

Vertical repositioning of alerts when they are being closed, thus preventing gaps between them. Especially applicable if delay is long enough or set to zero.

This feature is activated by autoshrink option.

[lethosor]

Is there a way to make this apply to alerts that time out as well? (I've been trying to intercept bs.alert.closed events, but I haven't had any luck getting it to work so far.)