Issue #3306107 by b_sharpe, catch, carolpettirossi, quietone: Allow failed...

Issue #3306107 by b_sharpe, catch, carolpettirossi, quietone: Allow failed logins in maintenance mode to be themed differently to other maintenance pages

(cherry picked from commit b9161b4f)

core/modules/user/src/Form/UserLoginForm.php

@@ -284,7 +284,7 @@ public function validateFinal(array &$form, FormStateInterface $form_state) {
           // We did not find a uid, so the limit is IP-based.
           $message = $this->t('Too many failed login attempts from your IP address. This IP address is temporarily blocked. Try again later or <a href=":url">request a new password</a>.', [':url' => Url::fromRoute('user.pass')->toString()]);
         }
-        $response = $this->bareHtmlPageRenderer->renderBarePage(['#markup' => $message], $this->t('Login failed'), 'maintenance_page');
+        $response = $this->bareHtmlPageRenderer->renderBarePage(['#markup' => $message], $this->t('Login failed'), 'maintenance_page__flood');
         $response->setStatusCode(403);
         $form_state->setResponse($response);
       }

core/modules/user/tests/src/Functional/UserLoginTest.php

@@ -311,7 +311,7 @@ public function assertFailedLogin(User $account, ?string $flood_trigger = NULL):
         ->fetchField();
       if ($flood_trigger == 'user') {
         $this->assertSession()->pageTextMatches("/There (has|have) been more than \w+ failed login attempt.* for this account. It is temporarily blocked. Try again later or request a new password./");
-        $this->assertSession()->elementExists('css', 'body.maintenance-page');
+        $this->assertSession()->elementExists('css', 'body.maintenance-page--flood');
         $this->assertSession()->linkExists("request a new password");
         $this->assertSession()->linkByHrefExists(Url::fromRoute('user.pass')->toString());
         $this->assertEquals('Flood control blocked login attempt for uid %uid from %ip', $last_log, 'A watchdog message was logged for the login attempt blocked by flood control per user.');
@@ -319,7 +319,7 @@ public function assertFailedLogin(User $account, ?string $flood_trigger = NULL):
       else {
         // No uid, so the limit is IP-based.
         $this->assertSession()->pageTextContains("Too many failed login attempts from your IP address. This IP address is temporarily blocked. Try again later or request a new password.");
-        $this->assertSession()->elementExists('css', 'body.maintenance-page');
+        $this->assertSession()->elementExists('css', 'body.maintenance-page--flood');
         $this->assertSession()->linkExists("request a new password");
         $this->assertSession()->linkByHrefExists(Url::fromRoute('user.pass')->toString());
         $this->assertEquals('Flood control blocked login attempt from %ip', $last_log, 'A watchdog message was logged for the login attempt blocked by flood control per IP.');