Apply 'with_active' option to winit (#2813)

* feat: apply 'with_active' option to winit

* fix: remove platform specification

- winit accept this option for all platforms

* build fix

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

crates/eframe/src/epi.rs

@@ -284,6 +284,9 @@ pub struct NativeOptions {
     /// Generally you would use this in conjunction with always_on_top
     pub mouse_passthrough: bool,
 
+    /// Whether grant focus when window initially opened. True by default.
+    pub active: bool,
+
     /// Turn on vertical syncing, limiting the FPS to the display refresh rate.
     ///
     /// The default is `true`.
@@ -421,6 +424,9 @@ impl Default for NativeOptions {
             resizable: true,
             transparent: false,
             mouse_passthrough: false,
+
+            active: true,
+
             vsync: true,
             multisampling: 0,
             depth_buffer: 0,

crates/eframe/src/native/epi_integration.rs

@@ -91,6 +91,7 @@ pub fn window_builder<E>(
         resizable,
         transparent,
         centered,
+        active,
         ..
     } = native_options;
 
@@ -104,6 +105,7 @@ pub fn window_builder<E>(
         .with_resizable(*resizable)
         .with_transparent(*transparent)
         .with_window_icon(window_icon)
+        .with_active(*active)
         // Keep hidden until we've painted something. See https://github.com/emilk/egui/pull/2279
         // We must also keep the window hidden until AccessKit is initialized.
         .with_visible(false);