Function preventBackspace

app/core/application.js:19–26

(event)

// Prevent Ctrl/Cmd + [ / ], P, S
const ctrlDefaultPrevented = [219, 221, 80, 83]
const preventBackspace = function (event) {
  if ((event.keyCode === 8) && !elementAcceptsKeystrokes(event.srcElement || event.target)) {
    return event.preventDefault()
  } else if ((event.ctrlKey || event.metaKey) && !event.altKey && Array.from(ctrlDefaultPrevented).includes(event.keyCode)) {
    console.debug('Prevented keystroke', key, event)
    return event.preventDefault()
  }
}

let elementAcceptsKeystrokes = function (el) {
  // http://stackoverflow.com/questions/1495219/how-can-i-prevent-the-backspace-key-from-navigating-back