Add a rwh_05 feature flag

This allows using accesskit with current versions of wgpu.

Winit has a similar system to widden its support. See

rust-windowing/winit#3126

platforms/winit/Cargo.toml

@@ -14,13 +14,15 @@ edition = "2021"
 features = ["winit/rwh_06", "winit/x11", "winit/wayland"]
 
 [features]
-default = ["accesskit_unix", "async-io"]
+default = ["accesskit_unix", "async-io", "rwh_06"]
+rwh_06 = ["winit/rwh_06"]
+rwh_05 = ["winit/rwh_05"]
 async-io = ["accesskit_unix/async-io"]
 tokio = ["accesskit_unix/tokio"]
 
 [dependencies]
 accesskit = { version = "0.12.1", path = "../../common" }
-winit = { version = "0.29", default-features = false, features = ["rwh_06"] }
+winit = { version = "0.29", default-features = false }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 accesskit_windows = { version = "0.15.1", path = "../windows" }
@@ -34,4 +36,4 @@ accesskit_unix = { version = "0.6.1", path = "../unix", optional = true, default
 [dev-dependencies.winit]
 version = "0.29"
 default-features = false
-features = ["rwh_06", "x11", "wayland", "wayland-dlopen", "wayland-csd-adwaita"]
+features = ["x11", "wayland", "wayland-dlopen", "wayland-csd-adwaita"]

platforms/winit/src/lib.rs

@@ -11,6 +11,9 @@ use winit::{
 
 mod platform_impl;
 
+#[cfg(all(feature = "rwh_05", feature = "rwh_06"))]
+compile_error!("Cannot enable both 'rwh_05' and 'rwh_06' features at the same time");
+
 #[derive(Debug)]
 pub struct ActionRequestEvent {
     pub window_id: WindowId,

platforms/winit/src/platform_impl/macos.rs

@@ -23,7 +23,10 @@ impl Adapter {
         action_handler: ActionHandlerBox,
     ) -> Self {
         let view = match window.window_handle().unwrap().as_raw() {
+            #[cfg(feature = "rwh_06")]
             RawWindowHandle::AppKit(handle) => handle.ns_view.as_ptr(),
+            #[cfg(feature = "rwh_05")]
+            RawWindowHandle::AppKit(handle) => handle.ns_view,
             RawWindowHandle::UiKit(_) => unimplemented!(),
             _ => unreachable!(),
         };

platforms/winit/src/platform_impl/windows.rs

@@ -23,7 +23,10 @@ impl Adapter {
         action_handler: ActionHandlerBox,
     ) -> Self {
         let hwnd = match window.window_handle().unwrap().as_raw() {
+            #[cfg(feature = "rwh_06")]
             RawWindowHandle::Win32(handle) => HWND(handle.hwnd.get()),
+            #[cfg(feature = "rwh_05")]
+            RawWindowHandle::Win32(handle) => handle.hwnd as isize,
             RawWindowHandle::WinRt(_) => unimplemented!(),
             _ => unreachable!(),
         };