fix: changed IconMenuItem::set_native_icon to take &self

.changes/native_icon.md

@@ -0,0 +1,5 @@
+---
+"muda": "patch"
+---
+
+Changed `IconMenuItem::set_native_icon` to take `&self` instead of `&mut self`.

src/items/icon.rs

@@ -176,7 +176,7 @@ impl IconMenuItem {
     /// ## Platform-specific:
     ///
     /// - **Windows / Linux**: Unsupported.
-    pub fn set_native_icon(&mut self, _icon: Option<NativeIcon>) {
+    pub fn set_native_icon(&self, _icon: Option<NativeIcon>) {
         #[cfg(target_os = "macos")]
         self.inner.borrow_mut().set_native_icon(_icon)
     }

src/items/submenu.rs

@@ -132,7 +132,7 @@ impl Submenu {
         self.inner.borrow_mut().remove(item)
     }
 
-    /// Remove the menu item at the specified position from this submenu.
+    /// Remove the menu item at the specified position from this submenu and returns it.
     pub fn remove_at(&self, position: usize) -> Option<MenuItemKind> {
         let mut items = self.items();
         if items.len() > position {

src/menu.rs

@@ -144,7 +144,7 @@ impl Menu {
         self.inner.borrow_mut().remove(item)
     }
 
-    /// Remove the menu item at the specified position from this menu.
+    /// Remove the menu item at the specified position from this menu and returns it.
     pub fn remove_at(&self, position: usize) -> Option<MenuItemKind> {
         let mut items = self.items();
         if items.len() > position {