[Question] Keep 2nd window on top of others, works in Windows but not Raspberry Pi OS

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

Question

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Operating System

Raspberry Pi OS 32 Bit - latest

PySimpleGUI Port (tkinter, Qt, Wx, Web)

tkinter

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Versions

Version information can be obtained by calling sg.main_get_debug_data()
Or you can print each version shown in ()

Python version (sg.sys.version)

3.7.3

PySimpleGUI Version (sg.__version__)

4.43.0

GUI Version (tkinter (sg.tclversion_detailed), PySide2, WxPython, Remi)

Python version: 3.7.3 (default, Jul 25 2020, 13:03:44)
[GCC 8.3.0]
port: tkinter
tkinter version: 8.6.9
PySimpleGUI version: 4.43.0
PySimpleGUI filename: /home/pi/.local/lib/python3.7/site-packages/PySimpleGUI/PySimpleGUI.py

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Your Experience In Months or Years (optional)

Years Python programming experience
Couple
Years Programming experience overall
Hobby
Have used another Python GUI Framework? (tkinter, Qt, etc) (yes/no is fine)
tkinter
Anything else you think would be helpful?

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Troubleshooting

These items may solve your problem. Please check those you've done by changing - [ ] to - [X]

• [y ] Searched main docs for your problem www.PySimpleGUI.org
• [ y] Looked for Demo Programs that are similar to your goal Demos.PySimpleGUI.org
• If not tkinter - looked for Demo Programs for specific port
• [y ] 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
• Tried using the PySimpleGUI.py file on GitHub. Your problem may have already been fixed but not released

Detailed Description

Keep 2nd window on top of others in Linux -- works in Windows but not Linux

Attempting to keep 2nd Keypad window on top of others in multi window program.
Works without issue On MS-Windows but Not on Linux.
This is similar to question asked on https://github.com/PySimpleGUI/PySimpleGUI/issues/3719
Tried using win.TKroot.wm_attributes("-topmost", 1) from other web searches but not working in Linux
Any help would be appritiated.
Thanks - Dan

Code To Duplicate

A short program that isolates and demonstrates the problem (Do not paste your massive program, but instead 10-20 lines that clearly show the problem)

This pre-formatted code block is all set for you to paste in your bit of code:

import PySimpleGUI as sg
sg.theme('LightGreen5')
btn_font = "'Helvetica', 10"
input_font = "'Helvetica', 13" 
label_font = "'Helvetica',   13"

def keypad_input(window):
    layout = [[sg.Button(i, size=(5, 2)) for i in j] for j in ("123", "456", "789", "<0C")] + [
                [sg.Button("Enter", size=(26, 2))]]

    win = sg.Window('OrderNo',layout, no_titlebar= True, keep_on_top=True,  modal=True, finalize=True)
    win.TKroot.wm_attributes("-topmost", 1)

    buffer = ''
    while True:
        event, values = win.read()   
        if event == 'Enter':
            win.close()
            return buffer
        elif event in "0123456789<C":
            if event == '<' and len(buffer) > 0:
                buffer = buffer[:-1]
            elif event == 'C' and len(buffer) > 0:
                buff_length = len(buffer)
                buffer = "" # buffer[:-1 (buff_length)]
            elif event != "<":
                buffer += event
                
        window['_OrderNo_'].update(buffer)
  
def main():
    layout = [[sg.Button('Order Number'),sg.Input('', key='_OrderNo_', size=(5, 1), font=input_font)],
               [sg.Button('Exit')]]

    window = sg.Window('Test1', layout, size=(1200, 800), finalize=True)

    window.Maximize()
    
    while True:             # Event Loop
        print("loop")
        event, values = window.read()
        if event == sg.WIN_CLOSED or event == 'Exit':
            break
        if event == 'Order Number':
            keypad_input(window)
          
    window.close()

if __name__ == '__main__':
    main()

Screenshot, Sketch, or Drawing

Start with the supplied keypad_input example on Raspberry Pi OS 32-bit using Python 3.7.3, PySimpleGUI 4.43.0, and tkinter. Reproduce the behavior around keep_on_top, modal, and win.TKroot.wm_attributes("-topmost", 1), then compare it with Windows; done means the second keypad window remains above other windows on Raspberry Pi OS.