macOS find: page matches drawn with the CSS Custom Highlight API (window.find showed nothing while the page was not the key view); --diag logs exit requests, window close/destroy and each native pane placement on macOS

crates/waybetter-host/src/app.rs

@@ -699,7 +699,7 @@ async fn tab_zoom(webview: Webview, app: AppHandle, id: String, factor: Option<f
 
 /// Find in page for tab `id` (the shell's find bar): `start` with a query, `next`, `previous`, `stop`.
 /// The engine's own find where this build can drive it (counts arrive as `tab-find` events), else the
-/// evaluated `window.find`. The query is one typed line (validated) and is kept nowhere.
+/// evaluated Custom Highlight script. The query is one typed line (validated) and is kept nowhere.
 #[tauri::command]
 async fn tab_find(webview: Webview, app: AppHandle, id: String, action: String, query: Option<String>) -> Result<(), String> {
     shell_only(&webview)?;
@@ -1454,8 +1454,22 @@ impl App {
                     handler(invoke)
                 }
             })
-            .run(context)
-            .unwrap_or_else(|error| panic!("Failed to launch {}: {error}", config.title));
+            .build(context)
+            .unwrap_or_else(|error| panic!("Failed to launch {}: {error}", config.title))
+            .run(|_, event| log_run_event(&event));
+    }
+}
+
+/// Why the app is going away, for `--diag` ([`crate::diag`]): an exit request with its code (None is a
+/// polite quit from outside: Cmd+Q, the Dock, or another app such as an auto-quitter closing the last
+/// window), window close/destroy events and the final exit. Nothing is written without diagnostics.
+fn log_run_event(event: &tauri::RunEvent) {
+    match event {
+        tauri::RunEvent::ExitRequested { code, .. } => crate::diag::log("host", &format!("exit requested code={code:?}")),
+        tauri::RunEvent::Exit => crate::diag::log("host", "exit"),
+        tauri::RunEvent::WindowEvent { label, event: tauri::WindowEvent::CloseRequested { .. }, .. } => crate::diag::log("host", &format!("window {label} close requested")),
+        tauri::RunEvent::WindowEvent { label, event: tauri::WindowEvent::Destroyed, .. } => crate::diag::log("host", &format!("window {label} destroyed")),
+        _ => {}
     }
 }