message: refactor(background): use textarea to load clipboard content
diff: @@ -234,11 +234,15 @@ function getClipboard (): Promise<string> {
  if (process.env.NODE_ENV === 'development') {
  return Promise.resolve('clipboard content')
  } else {
  - const el = document.createElement('input')
  + let el = document.getElementById('saladict-paste') as HTMLTextAreaElement | null
  + if (!el) {
  + el = document.createElement('textarea')
  + el.id = 'saladict-paste'
  document.body.appendChild(el)
  + }
  + el.value = ''
  el.focus()
  document.execCommand('paste')
  - el.remove()
  return Promise.resolve(el.value || '')
  }
  }
  