message: Do not duplicate `#` when using the `y` permalink shortcut
  Given the issue `#1609`, it looks like `document.location.hash` already bundles `#`?
diff: if (ev.key == "y") {
  let permalink = document.getElementById("permalink");
  if (document.location.hash != "") {
  - permalink.href += "#" + document.location.hash;
  + permalink.href += document.location.hash;
  }
  history.replaceState({}, null, permalink.href);
  }
  