feat: Add an owned display handle type

This was supposed to be rolled out with the rwh v0.6 update, but it
was left behind for some reason. I've added this type back.

Signed-off-by: John Nunley <dev@notgull.net>

src/platform_impl/windows/event_loop.rs

@@ -584,11 +584,34 @@ impl EventLoopWindowTarget {
         self.runner_shared.clear_exit();
     }
 
+    pub(crate) fn owned_display_handle(&self) -> OwnedDisplayHandle {
+        OwnedDisplayHandle
+    }
+
     fn exit_code(&self) -> Option<i32> {
         self.runner_shared.exit_code()
     }
 }
 
+#[derive(Clone)]
+pub(crate) struct OwnedDisplayHandle;
+
+impl OwnedDisplayHandle {
+    #[cfg(feature = "rwh_05")]
+    #[inline]
+    pub fn raw_display_handle_rwh_05(&self) -> rwh_05::RawDisplayHandle {
+        rwh_05::WindowsDisplayHandle::empty().into()
+    }
+
+    #[cfg(feature = "rwh_06")]
+    #[inline]
+    pub fn raw_display_handle_rwh_06(
+        &self,
+    ) -> Result<rwh_06::RawDisplayHandle, rwh_06::HandleError> {
+        Ok(rwh_06::WindowsDisplayHandle::new().into())
+    }
+}
+
 /// Returns the id of the main thread.
 ///
 /// Windows has no real API to check if the current executing thread is the "main thread", unlike

src/platform_impl/windows/mod.rs

@@ -8,7 +8,8 @@ use windows_sys::Win32::{
 
 pub(crate) use self::{
     event_loop::{
-        EventLoop, EventLoopProxy, EventLoopWindowTarget, PlatformSpecificEventLoopAttributes,
+        EventLoop, EventLoopProxy, EventLoopWindowTarget, OwnedDisplayHandle,
+        PlatformSpecificEventLoopAttributes,
     },
     icon::{SelectedCursor, WinIcon},
     keyboard::{physicalkey_to_scancode, scancode_to_physicalkey},