feat(wayland): corner-radius protocol support

winit/src/platform_specific/wayland/commands/corner_radius.rs

@@ -0,0 +1,20 @@
+use iced_futures::core::{border::Radius, window};
+use iced_runtime::{
+    self,
+    platform_specific::{
+        self,
+        wayland::{self, CornerRadius},
+    },
+    task, Action, Task,
+};
+
+pub fn corner_radius(
+    id: window::Id,
+    corners: Option<CornerRadius>,
+) -> Task<()> {
+    task::oneshot(|_| {
+        Action::PlatformSpecific(platform_specific::Action::Wayland(
+            wayland::Action::RoundedCorners(id, corners),
+        ))
+    })
+}

winit/src/platform_specific/wayland/commands/mod.rs

@@ -1,6 +1,7 @@
 //! Interact with the wayland objects of your application.
 
 pub mod activation;
+pub mod corner_radius;
 pub mod keyboard_shortcuts_inhibit;
 pub mod layer_surface;
 pub mod overlap_notify;