Spinner: Don't change value when min/max changes

For consistency with the native

<input type="number">

, we should not change a spinner

<input>

's

value

when its

min

or

max

options change - even if the

value

becomes invalid. We should also not trigger a

change

event.

Here's some examples of the current native and jQuery UI behavior:

• Native: http://jsfiddle.net/tj_vantoll/wLe4b/
• jQuery UI: http://jsfiddle.net/tj_vantoll/zZVfG/