Revert "[10.x] Use fallback when previous URL is the same as the curr…

…ent (#46234)"

This reverts commit 552f353.

src/Illuminate/Routing/UrlGenerator.php

@@ -158,7 +158,7 @@ public function previous($fallback = false)
 
         $url = $referrer ? $this->to($referrer) : $this->getPreviousUrlFromSession();
 
-        if ($url && rtrim($url, '/') !== $this->request->fullUrl()) {
+        if ($url) {
             return $url;
         } elseif ($fallback) {
             return $this->to($fallback);

tests/Routing/RoutingUrlGeneratorTest.php

@@ -734,32 +734,6 @@ public function testPreviousPath()
         $this->assertSame('/bar', $url->previousPath('/bar'));
     }
 
-    public function testWhenPreviousIsEqualToCurrent()
-    {
-        $url = new UrlGenerator(
-            new RouteCollection,
-            Request::create('http://www.foo.com/')
-        );
-
-        $url->getRequest()->headers->set('referer', 'http://www.foo.com/');
-        $this->assertSame('http://www.foo.com', $url->previous());
-        $this->assertSame('http://www.foo.com/bar', $url->previous('/bar'));
-
-        $url->setRequest(Request::create('http://www.foo.com/bar'));
-
-        $url->getRequest()->headers->set('referer', 'http://www.foo.com/bar');
-        $this->assertSame('http://www.foo.com', $url->previous());
-        $this->assertSame('http://www.foo.com/bar', $url->previous('/bar'));
-        $this->assertSame('http://www.foo.com/baz', $url->previous('/baz'));
-
-        $url->setRequest(Request::create('http://www.foo.com/bar?page=2'));
-
-        $url->getRequest()->headers->set('referer', 'http://www.foo.com/bar?page=2');
-        $this->assertSame('http://www.foo.com', $url->previous());
-        $this->assertSame('http://www.foo.com/bar', $url->previous('/bar'));
-        $this->assertSame('http://www.foo.com/bar?page=2', $url->previous('/bar?page=2'));
-    }
-
     public function testRouteNotDefinedException()
     {
         $this->expectException(RouteNotFoundException::class);