[Bug] Multiline element not generating events for pressing enter when enter_submits=True

Type of Issue (Enhancement, Error, Bug, Question)

Bug

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Operating System

Windows 11

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PySimpleGUI Port (tkinter, Qt, Wx, Web)

tkinter

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Versions

Python version: 3.11.6 (tags/v3.11.6:8b6ee5b, Oct 2 2023, 14:57:12) [MSC v.1935 64 bit (AMD64)]
port: tkinter
tkinter version: 8.6.12
PySimpleGUI version: 4.60.5
PySimpleGUI filename: c:\Users\XXX\venv\Lib\site-packages\PySimpleGUI\PySimpleGUI.py

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Troubleshooting

• Searched main docs for your problem www.PySimpleGUI.org
• Looked for Demo Programs that are similar to your goal. It is recommend you use the Demo Browser! Demos.PySimpleGUI.org
• None of your GUI code was generated by an AI algorithm like GPT
• If not tkinter - looked for Demo Programs for specific port
• For non tkinter - Looked at readme for your specific port if not PySimpleGUI (Qt, WX, Remi)
• Run your program outside of your debugger (from a command line)
• Searched through Issues (open and closed) to see if already reported Issues.PySimpleGUI.org
• Have upgraded to the latest release of PySimpleGUI on PyPI (lastest official version)
• Tried using the PySimpleGUI.py file on GitHub. Your problem may have already been fixed but not released

Detailed Description

The argument enter_submits=True in Multiline is not causing events to be generated upon hitting the Return key.

• When enable_events=True and enter_submits=False the Return key generates an event like all other key-presses.
• When enable_events=True and enter_submits=True no event is generated by the Return key. A new line is generated in the window.

Code To Duplicate

import PySimpleGUI as sg

def make_layout(enable_events: bool, enter_submits: bool) -> sg.Multiline:
    value = f"{enable_events=}, {enter_submits=}"
    return sg.Multiline(
        value,
        size=(20, 5),
        enable_events=enable_events,
        enter_submits=enter_submits,
        key=value,
    )

layout = [
    [make_layout(False, False), make_layout(False, True)],
    [make_layout(True, False), make_layout(True, True)],
]

window = sg.Window(
    title="Various combinations of multiline options", layout=layout, finalize=True
)

while True:
    event, values = window.read() 
    if event == sg.WIN_CLOSED:
        break
    print(f"Got event: {event}, with value: '{values[event]}'")

window.close()

Screenshot, Sketch, or Drawing

Neither of the multiline boxes in the right column generate events when the Enter key is pressed. The enable_events=True, enter_submits=False box in the lower left does.

Apologies if this is user error and not a bug.

Thanks!

Start by running the provided tkinter reproduction and trace the Multiline handling for enable_events=True with enter_submits=True. Compare it with the working enter_submits=False case; done means pressing Enter generates an event while preserving the intended enter_submits behavior.