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.

});
        if (this.data.actions?.Keystroke) {
          element.addEventListener("beforeinput", event => {
            const { data, target } = event;
            const { value, selectionStart, selectionEnd } = target;
            let selStart = selectionStart,
              selEnd = selectionEnd;
            switch (event.inputType) {
              
              case "deleteWordBackward": {
                const match = value
                  .substring(0, selectionStart)
                  .match(/\w*[^\w]*$/);
                if (match) {
                  selStart -= match[0].length;
                }
                break;
              }
              case "deleteWordForward": {
                const match = value
                  .substring(selectionStart)
                  .match(/^[^\w]*\w*/);
                if (match) {
                  selEnd += match[0].length;
                }
                break;
              }
              case "deleteContentBackward":
                if (selectionStart === selectionEnd) {
                  selStart -= 1;