HalfWhitt

import toga


class WindowSubclass(toga.Window):
    pass


class TestMergeApp(toga.App):
    def startup(self):
        self.main_window = toga.MainWindow(title="Main Window")

HalfWhitt

import toga
from toga_cocoa.libs import NSWindow


class TestTabApp(toga.App):
    def startup(self):
        self.main_window = toga.MainWindow(
            title=f"Main Window: Created while {NSWindow.allowsAutomaticWindowTabbing}"
        )
        self.status_label = toga.Label(str(NSWindow.allowsAutomaticWindowTabbing))