message: Fix multiple danmaku bars, again (fix
diff: if ([leftController, originalTextArea, sendButton].some(it => it === null)) {
  return
  }
  + if (dq(controlBar, `.${danmakuSendBarClass}`)) {
  + return
  + }
  const DanmakuSendBar = Vue.extend({
  template: /*html*/`
  