fixed macos dock icon visibility issue

src-tauri/src/lib.rs

@@ -50,7 +50,7 @@ pub fn run() {
     #[cfg(target_os = "macos")]
     let builder = builder.plugin(ui::activation_policy::ActivationPolicy::default());
 
-    builder
+    let app = builder
         .plugin(tauri_plugin_updater::Builder::new().build())
         .plugin(tauri_plugin_autostart::init(
             tauri_plugin_autostart::MacosLauncher::LaunchAgent,
@@ -74,8 +74,16 @@ pub fn run() {
             Ok(())
         })
         .build(tauri::generate_context!())
-        .expect("error while running tauri application")
+        .expect("error while building tauri application");
-        .run(|_, e| {
+
+    #[cfg(target_os = "macos")]
+    let app = {
+        let mut app = app;
+        app.set_activation_policy(tauri::ActivationPolicy::Accessory);
+        app
+    };
+
+    app.run(|_, e| {
         if let tauri::RunEvent::ExitRequested { code, api, .. } = e {
             if code.is_none() {
                 api.prevent_exit();

src-tauri/src/ui/activation_policy.rs

@@ -6,7 +6,8 @@ use tauri::{AppHandle, Manager, RunEvent, Window, WindowEvent, Wry, plugin::Plug
 #[derive(Default)]
 pub struct ActivationPolicy {
     windows: HashSet<String>,
-    applied_regular: Option<bool>,
+    /// `lib::run` establishes Accessory before the event loop starts.
+    applied_regular: bool,
 }
 
 impl ActivationPolicy {
@@ -23,13 +24,13 @@ impl ActivationPolicy {
 
     fn reconcile(&mut self, app: &AppHandle) -> tauri::Result<()> {
         let regular = !self.windows.is_empty();
-        if self.applied_regular != Some(regular) {
+        if self.applied_regular != regular {
             app.set_activation_policy(if regular {
                 tauri::ActivationPolicy::Regular
             } else {
                 tauri::ActivationPolicy::Accessory
             })?;
-            self.applied_regular = Some(regular);
+            self.applied_regular = regular;
         }
         Ok(())
     }
@@ -40,15 +41,6 @@ impl Plugin<Wry> for ActivationPolicy {
         "activation-policy"
     }
 
-    fn initialize(
-        &mut self,
-        app: &AppHandle,
-        _config: serde_json::Value,
-    ) -> Result<(), Box<dyn std::error::Error>> {
-        self.reconcile(app)?;
-        Ok(())
-    }
-
     fn window_created(&mut self, window: Window) {
         self.record_window(window.label(), true);
         if let Err(error) = self.reconcile(window.app_handle()) {