// toggle collapse when clicked outside link, without drag
$(document)
  .on('mousedown', '.block-collapse', function (e) {
    let $bc = $(e.target).closest('.block-collapse')
    $bc.data('mx', e.screenX)
    $bc.data('my', e.screenY)
  })
  .on('mouseup', '.block-collapse', function (e) {
    if (e.target.nodeName === 'A') return
    let $bc = $(e.target).closest('.block-collapse')

    if (typeof $bc.data('mx') !== 'undefined') {
      let x0 = +$bc.data('mx')
      let y0 = +$bc.data('my')
      if (Math.abs(x0 - e.screenX) > 5 || Math.abs(y0 - e.screenY) > 5) {
        // drag
      } else {
        $(e.target).closest('.block-collapse').toggleClass('reveal')
      }
    }
  })