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* [X] I have followed the instructions in the PR template This PR fixes a ghosting issue I encountered while making a native macOS transparent overlay app using egui and eframe by exposing the [existing macOS window attribute `has_shadow`](https://docs.rs/winit/latest/winit/platform/macos/trait.WindowExtMacOS.html#tymethod.has_shadow) to the `ViewportBuilder` via a new `with_has_shadow` option. ## Example of Ghosting Issue ### Before `ViewportBuilder::with_has_shadow` By default, the underlying `winit` window's `.has_shadow()` defaults to `true`. https://github.com/user-attachments/assets/c3dcc2bd-535a-4960-918e-3ae5df503b12 ### After `ViewportBuilder::with_has_shadow` https://github.com/user-attachments/assets/484462a1-ea88-43e6-85b4-0bb9724e5f14 Source code for the above example can be found here: https://github.com/gaelanmcmillan/egui-overlay-app-with-shadow-artifacts-example/blob/main/src/main.rs ### Further background By default on macOS, `winit` windows have a drop-shadow effect. When creating a fully transparent overlay GUI, this drop-shadow can create a ghosting effect, as the window content has a drop shadow which is not cleared by the app itself. This issue has been experienced by users of `bevy`, another Rust project that has an upstream dependency on `winit`: https://github.com/bevyengine/bevy/issues/18673 |
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