feat: expose internal TrayIcon (#13959)

Author: petersamokhin

.changes/expose-inner-tray-icon.md

@@ -0,0 +1,8 @@
+---
+"tauri": 'minor:enhance'
+---
+
+Introduce `with_inner_tray_icon` for Tauri `TrayIcon` to access the inner platform-specific tray icon.
+
+Note that `tray-icon` crate may be updated in minor releases of Tauri.
+Therefore, it’s recommended to pin Tauri to at least a minor version when you’re using `with_inner_tray_icon`.

crates/tauri/src/tray/mod.rs

@@ -603,6 +603,18 @@ impl<R: Runtime> TrayIcon<R> {
       })
     })
   }
+
+  /// Do something with the inner [`tray_icon::TrayIcon`] on main thread
+  ///
+  /// Note that `tray-icon` crate may be updated in minor releases of Tauri.
+  /// Therefore, it’s recommended to pin Tauri to at least a minor version when you’re using `with_inner_tray_icon`.
+  pub fn with_inner_tray_icon<F, T>(&self, f: F) -> crate::Result<T>
+  where
+    F: FnOnce(&tray_icon::TrayIcon) -> T + Send + 'static,
+    T: Send + 'static,
+  {
+    run_item_main_thread!(self, |self_: Self| { f(&self_.inner) })
+  }
 }
 
 impl<R: Runtime> Resource for TrayIcon<R> {