Escape key used as toga.Command shortcut does not trigger callback

Describe the bug

The Escape key does not work on macOS when specified as a shortcut to a toga.Command. The keystroke is merely ignored.

Steps to reproduce

Put the following code in a python file:

from toga import Group
from toga import Key, Icon
from toga.style import Pack
from toga.style.pack import COLUMN

def key_press_event(e):
    print(e)
    app.exit()

def build(app):
    main_window = toga.MainWindow(title='ExitMenuTest', size=(300, 200))

    box1 = toga.Box(style=Pack(direction=COLUMN))

    mylabel = toga.Label('Press "Escape" or "x" on the keyboard to exit\n')
    box1.add(mylabel)

    cmd1 = toga.Command(
        key_press_event,
        'Exit program',
        group=Group.FILE,
        shortcut=Key.ESCAPE,
        section=0
        )


    cmd2 = toga.Command(
        key_press_event,
        'Exit program1',
        group=Group.FILE,
        shortcut=Key.X,
        section=0
        )

    app.commands.add(cmd1,cmd2)

    return(box1)

if __name__ == '__main__':
    app = toga.App('ExitMenuTest', 'org.example.ExitMenuTest', startup=build, icon=toga.Icon.DEFAULT_ICON)
    app.main_loop()

Run the python file.

Pressing "X" on the keyboard when the app is open will quit the app, and hitting escape will not.

Expected behavior

The associated callback is run.

Screenshots

Environment

• Operating System: macOS 14.4.1 on Apple Silicon (23E224)
• Python version: 3.12.3
• Software versions:
  • Toga: 0.42

Logs

Additional context

No response

Start by reproducing the macOS behavior with the provided Python example, then trace how toga.Command handles Key.ESCAPE versus Key.X shortcuts. Done means pressing Escape invokes the associated callback just as pressing X does.