listview has no "clear" callback

[kilrogg]

Hi.

Thanks for your hard work on jquerymobile and for the inclusion of listview filter callbacks.

Implementing custom list filters got way easier now. Only thing missing now is a callback that gets called when the "clear" button in the list filter input field is clicked.

Could you implement that in the next release ?

Thanks

[jaspermdegroot]

@kilrogg - I added #4683 to https://github.com/jquery/jquery-mobile/wiki/Feature-Requests. Closing this as a feature request. Thanks!