Method clearBackup

modules/core/EditSystem.js:1235–1248

* clearBackup * Remove any backup stored in localStorage. * This happens when: * - The user chooses to "Discard my changes" from the restore screen * - The user switches sources with the source switcher * - A changeset is inflight, we remove it to prevent the user from restoring dupli

()

   * - A changeset is inflight, we remove it to prevent the user from restoring duplicate edits
   */
  clearBackup() {
    this._canRestoreBackup = false;
    this.deferredBackup.cancel();

    if (!this._mutex.locked()) return;  // another browser tab owns the history

    const storage = this.context.systems.storage;
    storage.removeItem(this._backupKey());

    // clear the changeset metadata associated with the saved history
    storage.removeItem('comment');
    storage.removeItem('hashtags');
    storage.removeItem('source');
  }


  /**