[GUI] Closing the GUI multiple times while being prompted stacks indefinitely

[tobe2098]

Describe the bug
When pressing the exit button from the GUI with a running instance and the option set to ask to whether stop or keep the instance running; the intended popup shows up and the GUI darkens slightly. If you press the button repeatedly, more popups will stack (which can be discovered when closing the existing one) and the GUI will continuously darken until it is completely black (the popups will still be visible).

To Reproduce
In any snap or build

1. multipass.gui
2. Get one instance running.
3. Change settings to prompt the user to stop instances.
4. Press the window close "x" button multiple times.

Expected behavior
Either prevent multiple popups, emit a tone and refocus the popup, or similar. No multiple stacking and progressively darkening of the GUI.

Additional info

• OS: Ubuntu 24.04
• CPU architecture or model: x86
• Any available version, both locally built or snaps.

[Basmala-Almalki]

Hi!
I’d like to work on this issue.

[tobe2098]

Hi @Basmala-Almalki, feel free to do so!