Window despawns before PostUpdate

[doonv]

Bevy version

main (1d5388e)

What you did

Create a system that queries for Window in the PostUpdate schedule.

What went wrong

This line right here in WindowPlugin:

bevy/crates/bevy_window/src/lib.rs

Line 126 in 1d5388e

app.add_systems(Update, close_when_requested);

The system that despawns the window entity runs during the Update schedule, this means there could be a situation where the window entity does not exist during the PostUpdate schedule. This happened to me and it caused a panic.

Additional information

This could be solved by putting the close_when_requested system in the Last or PostUpdate schedules instead. I don't know which is better though.

[rparrett]

Possibly related: #7403

[doonv]

I've been messing around with window-related system schedules and I can't seem to fix the bug.

There's a lot of systems that require another system to do something which then triggers the system to do something, and that system requires another system, etc... It's confusing.

[doonv]

This is still an issue as of b27896f.