Cleanup: replace std::iter::once(x) with [x]

crates/eframe/src/native/run.rs

@@ -657,7 +657,7 @@ mod glow_integration {
                     if let Some(window) = &viewport.window {
                         let is_viewport_focused = focused_viewport == Some(viewport_id);
                         egui_winit::process_viewport_commands(
-                            std::iter::once(command),
+                            [command],
                             window,
                             is_viewport_focused,
                         );
@@ -2561,11 +2561,7 @@ mod wgpu_integration {
                     .and_then(|vp| vp.window.as_ref())
                 {
                     let is_viewport_focused = focused_viewport == Some(viewport_id);
-                    egui_winit::process_viewport_commands(
+                    egui_winit::process_viewport_commands([command], window, is_viewport_focused);
-                        std::iter::once(command),
-                        window,
-                        is_viewport_focused,
-                    );
                 }
             }
 

crates/eframe/src/web/web_painter_wgpu.rs

@@ -270,11 +270,9 @@ impl WebPainter for WebPainterWgpu {
         }
 
         // Submit the commands: both the main buffer and user-defined ones.
-        render_state.queue.submit(
+        render_state
-            user_cmd_bufs
+            .queue
-                .into_iter()
+            .submit(user_cmd_bufs.into_iter().chain([encoder.finish()]));
-                .chain(std::iter::once(encoder.finish())),
-        );
 
         if let Some(frame) = frame {
             frame.present();

crates/egui-wgpu/src/winit.rs

@@ -615,7 +615,7 @@ impl Painter {
             crate::profile_scope!("Queue::submit");
             render_state
                 .queue
-                .submit(user_cmd_bufs.into_iter().chain(std::iter::once(encoded)));
+                .submit(user_cmd_bufs.into_iter().chain([encoded]));
         };
 
         let screenshot = if capture {