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.

unreachable("Abstract method `AnnotationElement.render` called");
  }
  /**
   * @private
   * @returns {Array}
   */
  _getElementsByName(name, skipId = null) {
    const fields = [];
    if (this._fieldObjects) {
      const fieldObj = this._fieldObjects[name];
      if (fieldObj) {
        for (const { page, id, exportValues } of fieldObj) {
          if (page === -1) {
            continue;
          }
          if (id === skipId) {
            continue;
          }
          const exportValue =
            typeof exportValues === "string" ? exportValues : null;
          const domElement = document.querySelector(
            `[data-element-id="${id}"]`
          );
          if (domElement && !GetElementsByNameSet.has(domElement)) {
            warn(`_getElementsByName - element not allowed: ${id}`);
            continue;