Popup window remains visible after alt+tab from editor in x11

[francoa]

Tested versions

• Reproducible in: 4.3.dev (f91db3d), 4.0.4-stable

System information

Godot v4.3.dev (f91db3d) - Ubuntu 20.04.6 LTS (Focal Fossa) - X11 - GLES3 (Compatibility)

Issue description

When alt-tab from the editor while having an open PopupMenu object, this Window remains visible, overlaying other windows unrelated to the editor. Might be related to #85403?

Steps to reproduce

• Create a new project
• Add a PointLight2D Node (although any node with a PopupMenu will work)
• Open the Texture options (also works with the Script options, at the bottom)
• Alt + Tab to another window that "replaces" the IDE

Minimal reproduction project (MRP)

test-project.zip

[francoa]

I have been working on a way to fix this issue. It involves sending a DisplayServerX11::WINDOW_EVENT_CLOSE_REQUEST event to the Focused Popup window whenever a FocusOut event is processed. I'm currently reading the Contribution Guide to follow the appropriate steps for submitting the proposal

[Sauermann]

It looks like #68856 is a potential duplicate.

[AThousandShips]

Both are probably functionally a duplicate of:

• NOTIFICATION_APPLICATION_FOCUS_IN / OUT doesn't trigger with Alt + Tab when a popup is open #63405