fix: update shell.openExternal to correctly focus on external window (#44408)

* fix: Use openURL:configuration:completionHandler instead of openUrl

* test: add a test

* fix: add dispatch_async to replace GetUIThreadTaskRunner

* refactor: remove unused import

* fix: update to use BindPostTaskToCurrentDefault

* test: add regression test for window focus

* refactor: update to explicit task runner

Co-authored-by: Alice Zhao <alice@makenotion.com>

shell/common/platform_util_mac.mm

@@ -19,6 +19,7 @@
 #include "base/logging.h"
 #include "base/mac/scoped_aedesc.h"
 #include "base/strings/sys_string_conversions.h"
+#include "base/task/sequenced_task_runner.h"
 #include "base/task/thread_pool.h"
 #include "content/public/browser/browser_task_traits.h"
 #include "net/base/apple/url_conversions.h"
@@ -146,11 +147,27 @@ void OpenExternal(const GURL& url,
     return;
   }
 
-  bool success = [[NSWorkspace sharedWorkspace] openURL:ns_url];
-  if (success && options.activate)
-    [NSApp activateIgnoringOtherApps:YES];
+  NSWorkspaceOpenConfiguration* configuration =
+      [NSWorkspaceOpenConfiguration configuration];
+  configuration.activates = options.activate;
+
+  __block OpenCallback copied_callback = std::move(callback);
+  scoped_refptr<base::SequencedTaskRunner> runner =
+      base::SequencedTaskRunner::GetCurrentDefault();
 
-  std::move(callback).Run(success ? "" : "Failed to open URL");
+  [[NSWorkspace sharedWorkspace]
+                openURL:ns_url
+          configuration:configuration
+      completionHandler:^(NSRunningApplication* _Nullable app,
+                          NSError* _Nullable error) {
+        if (error) {
+          runner->PostTask(FROM_HERE, base::BindOnce(std::move(copied_callback),
+                                                     "Failed to open URL"));
+        } else {
+          runner->PostTask(FROM_HERE,
+                           base::BindOnce(std::move(copied_callback), ""));
+        }
+      }];
 }
 
 bool MoveItemToTrashWithError(const base::FilePath& full_path,

spec/api-shell-spec.ts

@@ -76,6 +76,21 @@ describe('shell module', () => {
         requestReceived
       ]);
     });
+
+    ifit(process.platform === 'darwin')('removes focus from the electron window after opening an external link', async () => {
+      const url = 'http://127.0.0.1';
+      const w = new BrowserWindow({ show: true });
+
+      await once(w, 'focus');
+      expect(w.isFocused()).to.be.true();
+
+      await Promise.all<void>([
+        shell.openExternal(url),
+        once(w, 'blur') as Promise<any>
+      ]);
+
+      expect(w.isFocused()).to.be.false();
+    });
   });
 
   describe('shell.trashItem()', () => {