raidboss: prevent duplicate button creation (#5794)

created only once, rather than multiple times.

ui/raidboss/autoplay_helper.ts

@@ -1,16 +1,27 @@
 export default class AutoplayHelper {
+ private static context?: AudioContext;
+ private static isButtonCreated = false;
+
+ private static getContext(): AudioContext {
+ AutoplayHelper.context ??= new AudioContext();
+ return AutoplayHelper.context;
+ }
+
  static CheckIfAlreadyRunning(): boolean {
  // This check will only ever succeed on running Chromium passing
  // --autoplay-policy=no-user-gesture-required
  // as command line argument or configuring CEF the correct way.
  // Once https://bugs.chromium.org/p/chromium/issues/detail?id=1106380
  // is fixed this function will return false on every (up-to-date) browser
- const context = new AudioContext();
+ const context = AutoplayHelper.getContext();
  return context.state === 'running';
  }
 
  static Prompt(): void {
- const context = new AudioContext();
+ if (AutoplayHelper.isButtonCreated) {
+ return;
+ }
+ const context = AutoplayHelper.getContext();
  const button = document.createElement('button');
  button.innerText = 'Click to enable audio';
  button.classList.add('autoplay-helper-button');
@@ -21,6 +32,7 @@ export default class AutoplayHelper {
  button.remove();
  };
  document.body.appendChild(button);
+ AutoplayHelper.isButtonCreated = true;
  }
 
  static CheckAndPrompt(): void {