bevy_egui blocks picking events even If bevy_egui is rendered under bevy_ui

[PPakalns]

bevy_egui blocks picking events even If bevy_egui is rendered under bevy_ui.

To reproduce, create overlay bevy_ui element that listens on Pointer<Click> event. Try to click it if under it are egui buttons. Instead of bevy ui button being clicked egui button gets clicked instead.

[vladbat00]

Hi! Thanks for the report. I've just checked how bevy_ui does that, and it seems we need to generate a pointer hit with the camera order value.
Also, depending on the render order setting, we should add either 0.4 or 0.6 to the camera order value (bevy_ui adds 0.5):
https://github.com/bevyengine/bevy/blob/16a6a96a80aab50dcc14c8bb73ef09520f77c09d/crates/bevy_ui/src/picking_backend.rs#L260-L264

[PPakalns]

Thanks. Changed following line to -1'000'000 and got it working.

bevy_egui/src/lib.rs

Line 1566 in 42dd71e

pub const PICKING_ORDER: f32 = 1_000_000.0;

I personally do not need official support for this added. We can keep issue open if someone else raises interest in this issue.

[vladbat00]

I think we should definitely fix it, as it looks like a bug and an oversight on the bevy_egui end :)
Could you please check if #443 fixes the issue for you?