Add ViewportInfo::occluded and visible

[emilk]

• Part of Web: Run App::logic even when hidden #5112
• Part of App::logic #5113
• Part of Wayland: request_repaint ignored if minimized #5136

Once we support calling App::logic when an app is occluded or minimized, it is useful to know that it is, in fact, occluded or minimized.

[github-actions]

Preview available at https://egui-pr-preview.github.io/pr/7948-emilkreport-occluded
Note that it might take a couple seconds for the update to show up after the preview_build workflow has completed.

View snapshot changes at kitdiff

[Copilot]

Pull request overview

Adds viewport occlusion state to egui’s ViewportInfo and wires native backends to populate it, enabling backends/apps to distinguish “hidden for rendering” from “should still run background logic” (per the linked issues).

Changes:

• Add ViewportInfo::occluded: Option<bool> and a ViewportInfo::visible() helper.
• Populate occluded from winit WindowEvent::Occluded in both wgpu and glow native integrations.
• Add a small native test app (tests/test_background_logic) to exercise background logic vs ui behavior and print viewport visibility flags.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
crates/egui/src/data/input.rs	Extends ViewportInfo with occluded and adds visible() + debug UI display.
crates/eframe/src/native/wgpu_integration.rs	Updates per-viewport info on winit occlusion events (wgpu backend).
crates/eframe/src/native/glow_integration.rs	Updates per-viewport info on winit occlusion events (glow backend).
tests/test_background_logic/src/main.rs	New test app that periodically repaints and logs minimized/focused/occluded/visible.
tests/test_background_logic/Cargo.toml	Adds the new test crate to the workspace.
Cargo.lock	Lockfile update to include the new test crate.

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[lucasmerlin]

Nice! It doesn't log minimized when I minimize on macOS but I guess thats an unrelated issue?

[emilk]

Indeed - making sure that ui and logic are called at the right times will come later