github diffs - add a 'hide' button to each file

diffcollapse.js

$('#files .meta .actions').append('<button class="btn-hide minibutton tooltipped tooltipped-n" aria-label="Hide this file">Hide</button>');
$('#files .meta .actions .btn-hide').on('click', function(){
  $(this).toggleClass('selected').closest('div.file').find('.data').toggleClass('hidden');
});