init: Disable mouse events the hard way based also on the presence of ui-state-disabled.
Navigation: When deciding whether to remove the active link class, exclude buttons that have ui-state-disabled as well.
Button: Toggle class ui-state-disabled in response to the value of the "disabled" option, and add ui-state-disabled during init instead of ui-disabled.
Checkboxradio: Set class ui-state-disabled in response to the value of the "disabled" option.
Custom select: Include .ui-state-disabled in the selector for inactive items.
Slider: Use class ui-state-disabled for indicating the disabled state rather than the deprecated ui-disabled.
Navbar: Use class ui-state-disabled in addition to class ui-disabled when determining the active button during vclick.
Unit tests: Checkboxradio: Expect ui-state-disabled when disabling a checkboxradio.