ButtonBehavior.on_touch_up dispatches on_release immediately

[rnixx]

ButtonBehavior.MIN_STATE_TIME defines a minimum time the button stays in down state. But the on_release event gets dispatched immediately. Imo it would be better to defer the event dispatching as well to ButtonBehavior._do_release, at least on demand.

Any objections?

-r

[rnixx]

uh, sry, wrong repo