GTK unable to put a menu item after submenu

[RastislavKish]

Describe the bug

I would like to achieve the following menu structure in a Greeter app:

Greeting {// The root group and menu
    - Style { //A subgroup and a submenu
        - Formal //Command
        - Informal //Command
    }
    - Greet //A command
}

However, when trying to do so, I end up with the following menu structure instead:

Greeting {// The root group and menu
    - Style { //A subgroup and a submenu
        - Formal //Command
        - Informal //Command
        - Greet //Command, shouldn't be here
    }
}

Steps to reproduce

1. Run the example code below
2. Click on the Greeting menu and see its structure, which is laid out as mentioned above

Expected behavior

With the proper configuration of parent groups and orders, the menu should be laid out like described in the goal structure.

Screenshots

No response

Environment

• Operating System: Ubuntu Mate 22.04 64-bit
• Python version: 3.10
• Software versions:
  • Toga: 0.4.2

Logs

Additional context

Here is the example code (the commands are dummy):

import toga
from toga import App, Command, Group, MainWindow

class GreeterWindow(MainWindow):

    def __init__(self):
        super().__init__(None, "Greeter")

        greeting_group=Group("Greeting")
        style_group=Group("Style", parent=greeting_group, order=1)

        formal=Command(self.formal,
            text="Formal",
            group=style_group,
            order=1,
            )
        informal=Command(self.informal,
            text="Informal",
            group=style_group,
            order=2,
            )
        greet=Command(self.greet,
            text="Greet",
            group=greeting_group,
            order=2,
            )

        self.toolbar.add(formal, informal, greet)

    def formal(self, sender):
        pass
    def informal(self, sender):
        pass

    def greet(self, sender):
        pass

class GreeterApp(App):

    def __init__(self):
        super().__init__("greeter", "com.example.greeter")

    def startup(self):
        self.main_window=GreeterWindow()
        self.main_window.show()

GreeterApp().main_loop()

Thanks!

[freakboy3742]

Thanks for the report - I can confirm I can reproduce this. It appears to be GTK specific; macOS and Windows both render the menu correctly.

The problem appears to be that the lookup of menu sections isn't contextual; as a result, the greeter is being added to the currently active section (the submenu), rather than the main section of the top level "greeting" menu. I should have a fix for this shortly.