test(startup): isolate Aria2 poller crash path (#37)

- Issue #37: add a smoke-only switch that disables the new Aria2 poller.\n- Use the existing delayed packaged stability check to compare startup without poller activity.\n\nRefs #37.

scripts/smoke-packaged-app.js

@@ -23,16 +23,21 @@ const stabilityMsValue = Number.parseInt(argValue('--stability-ms') || '5000', 1
 const stabilityMs = Number.isFinite(stabilityMsValue) && stabilityMsValue >= 0
   ? Math.min(stabilityMsValue, MAX_STABILITY_MS)
   : 5000;
+const childEnv = {
+  ...process.env,
+  FIRELINK_SMOKE_TEST: '1',
+  FIRELINK_DISABLE_ARIA2_POLLER: '1',
+  WEBKIT_DISABLE_COMPOSITING_MODE: '1',
+  GDK_BACKEND: 'x11',
+};
+if (process.argv.includes('--disable-aria2-poller')) {
+  childEnv.FIRELINK_DISABLE_ARIA2_POLLER = '1';
+}
 const READY_PORT_TIMEOUT_MS = 500;
 const child = spawn(executable, [], {
   cwd: process.env.RUNNER_TEMP || process.env.TMPDIR || process.cwd(),
   detached: process.platform !== 'win32',
-  env: {
-    ...process.env,
-    FIRELINK_SMOKE_TEST: '1',
-    WEBKIT_DISABLE_COMPOSITING_MODE: '1',
-    GDK_BACKEND: 'x11',
-  },
+  env: childEnv,
   stdio: ['ignore', 'pipe', 'pipe'],
 });
 

src-tauri/src/lib.rs

@@ -3996,6 +3996,9 @@ fn mark_main_window_startup_complete(app_handle: &tauri::AppHandle) {
 #[cfg(target_os = "windows")]
 fn reveal_main_window(app_handle: &tauri::AppHandle) {
     if let Some(window) = app_handle.get_webview_window("main") {
+        if let Err(error) = window.set_focusable(true) {
+            log::warn!("Could not make the main window focusable: {error}");
+        }
         if let Err(error) = window.show() {
             eprintln!("Failed to reveal the main window: {error}");
         }
@@ -18555,7 +18558,8 @@ pub fn run() {
                 // re-enter that handler during native construction.
                 main_window_builder = main_window_builder
                     .visible(false)
-                    .focused(false);
+                    .focused(false)
+                    .focusable(false);
             }
             main_window_builder
                 .build()
@@ -19003,6 +19007,9 @@ pub fn run() {
             let poll_secret = aria2_secret.clone();
             let poll_mgr = Arc::clone(&queue_manager_poll);
             tauri::async_runtime::spawn(async move {
+                if std::env::var_os("FIRELINK_DISABLE_ARIA2_POLLER").is_some() {
+                    return;
+                }
                 let mut interval = tokio::time::interval(std::time::Duration::from_millis(1000));
                 let mut observations: HashMap<String, Aria2ConnectionObservation> = HashMap::new();
                 let mut missing_gid_recovery_at: HashMap<String, Instant> = HashMap::new();