Attach (recommended) or Link to PDF file [here:] Can't see how to attach a pdf here, but it is simple to create. Add a form object textbox to a pdf and make sure the option for "Multiline" is true.

Steps to reproduce the problem:
1.  Open a document with a Textbox that is set to Multiline.
2. Attempt to hit the Enter key to go to a new line.

What is the expected behavior? The cursor goes to a new line.

What went wrong? It does not go to a new line.

Link to a viewer: It can be reproduced on mozilla.github.io/pdf.js

I corrected the issue by altering the pdf.js file like this
element.addEventListener("keydown", event => { 
[...]
--} else if (event.key === "Enter") {
++ } else if (event.key === "Enter" && !this.data.multiLine) {

Our initial testing is coming through clean, and hopefully something like this code can be committed to the project in the future.

intent: "richText",
        div: popup,
      });
      popup.lastChild.className = "richText popupContent";
    } else {
      const contents = this._formatContents(this.contentsObj);
      popup.append(contents);
    }
    if (!Array.isArray(this.trigger)) {
      this.trigger = [this.trigger];
    }
    
    for (const element of this.trigger) {
      element.addEventListener("click", this._toggle.bind(this));
      element.addEventListener("mouseover", this._show.bind(this, false));
      element.addEventListener("mouseout", this._hide.bind(this, false));
    }
    popup.addEventListener("click", this._hide.bind(this, true));
    wrapper.append(popup);
    return wrapper;
  }
  /**
   * Format the contents of the popup by adding newlines where necessary.
   *
   * @private
   * @param {Object<string, string>} contentsObj
   * @memberof PopupElement
   * @returns {HTMLParagraphElement}
   */
  _formatContents({ str, dir }) {