UTF-8 characters have the wrong encoding when using OMEMO

In converse.js I see UTF-8 characters (e.g. ü) from apps like Conversations or gajim as two bytes like ü and in Conversations I see � for such characters sent via Conversations.

The page includes:

<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

[allo-]

I managed to fix it by modifying the arrayBuffer <-> string methods:

  u.arrayBufferToString2 = function (ab) { 
    return new TextDecoder("utf-8").decode(ab);
  };
  u.stringToArrayBuffer2 = function (string) {
    const bytes = new TextEncoder("utf-8").encode(string)
    return bytes.buffer;
  };

Now it seems to work for me. I guess you need to implement it with a API which is supported by more/older browsers as well.

[jcbrand]

I did a git bisect and found that the offending commit is this one: https://github.com/conversejs/converse.js/commit/e05b7e9de3083cf8c867548ee5bc51bf421f76f3