checkboxradio widget: checkbox click doesn't work with UI lightness theme

checkboxradio widget: checkbox click doesn't work with UI lightness theme

It seems that checkboxradio widget doesn't work correctly for checkbox inputs when using UI lightness theme. Nothing happens when checkbox is clicked. I prepared a fiddle here:

  1. https://jsfiddle.net/d8hkmuvn/

The same happens with Le Frog theme for example. I'm using UI lightness without any modification.

I also notice some changes in icon placement and button width after upgrade to version 1.12. Here's the comparisson:

v1.12.1
  1. https://jsfiddle.net/5c7ycm3a/

v1.11.4
  1. https://jsfiddle.net/5c7ycm3a/2/
I could recreate the old position by adding the following css to my master page:
  1. button.ui-button{
  2.     padding: 0.4em 1em 0.4em 0.5em
  3. }
  4. span.ui-button-icon-space {
  5.     padding-left: 0.09em;
  6. }

Thanks in advance.