ui.accordion: Setting 'event' option after init does not rebind the event.

[mkemmerling]

Setting the 'event' option of the accordion widget after init does not rebind the event since the event is bound on creation of the widget only.

I worked around this by adding the following lines to _setOption:

if ( key === 'event' ) {
    this.headers.unbind( this.options.event );
    this._create();
}

This is in the spirit of ui.tabs which calls its create method (_tabify) for almost all options set after init.

Recreating the accordion does not seem to do any harm, but I am not sure about this. Of course the unbinding should better be done in _create istelf before binding the event.

[Scott González]

This works in master. Also, rerunning _create() is a bad idea, so is unbinding without a namespace.

[Scott González]

Duplicate of #6740.

[mkemmerling]

Thanks a lot for clarification and comments. I searched the tickets first but overlooked #6740. My fault, sorry.