Fixes controller computed middleware (#44454)

src/Illuminate/Routing/Route.php

@@ -306,6 +306,7 @@ protected function parseControllerCallback()
      */
     public function flushController()
     {
+        $this->computedMiddleware = null;
         $this->controller = null;
     }
 

tests/Routing/RoutingRouteTest.php

@@ -1772,14 +1772,17 @@ public function testRouteFlushController()
         $request = Request::create('count', 'GET');
 
         $response = $router->dispatch($request);
-        $this->assertSame(1, (int) $response->getContent());
+        $this->assertSame(1, $response->original['invokedCount']);
+        $this->assertSame(1, $response->original['middlewareInvokedCount']);
 
         $response = $router->dispatch($request);
-        $this->assertSame(2, (int) $response->getContent());
+        $this->assertSame(2, $response->original['invokedCount']);
+        $this->assertSame(2, $response->original['middlewareInvokedCount']);
 
         $request->route()->flushController();
         $response = $router->dispatch($request);
-        $this->assertSame(1, (int) $response->getContent());
+        $this->assertSame(1, $response->original['invokedCount']);
+        $this->assertSame(1, $response->original['middlewareInvokedCount']);
     }
 
     public function testJsonResponseIsReturned()
@@ -2323,15 +2326,29 @@ public function __invoke()
     }
 }
 
-class ActionCountStub
+class ActionCountStub extends Controller
 {
-    protected $count = 0;
+    protected $middlewareInvokedCount = 0;
+
+    protected $invokedCount = 0;
+
+    public function __construct()
+    {
+        $this->middleware(function ($request, $next) {
+            $this->middlewareInvokedCount++;
+
+            return $next($request);
+        });
+    }
 
     public function __invoke()
     {
-        $this->count++;
+        $this->invokedCount++;
 
-        return $this->count;
+        return [
+            'invokedCount' => $this->invokedCount,
+            'middlewareInvokedCount' => $this->middlewareInvokedCount,
+        ];
     }
 }