Prevent a urlencoded sub-URL in main URL path to be decoded.

src/Router/UrlGenerator.php

@@ -63,12 +63,21 @@ public static function buildUrl($url, $replace = [], $flags = HTTP_URL_REPLACE,
                    | HTTP_URL_STRIP_PASS;
         }
 
+        // Decode query parameters before parsing the URL
+        $decodeQueryParams = function (string $url): string {
+            if (Str::contains($url, '?')) {
+                list($urlWithoutQuery, $queryArgs) = explode('?', $url, 2);
+                $url = $urlWithoutQuery . '?' . urldecode($queryArgs);
+            }
+            return $url;
+        };
+
         // Parse input
         if (is_string($url)) {
-            $url = parse_url(urldecode($url));
+            $url = parse_url($decodeQueryParams($url));
         }
         if (is_string($replace)) {
-            $replace = parse_url(urldecode($replace));
+            $replace = parse_url($decodeQueryParams($replace));
         }
 
         // Prepare input data

tests/Router/UrlGeneratorTest.php

@@ -537,4 +537,32 @@ public function testQueryArgsArrayMatchLaravel()
             );
         }
     }
+
+    public function testEncodedUrlInPathMatchLaravel()
+    {
+        $urlInPath = 'https://testUrlInPath/path?k1=v1&k2';
+        $url = 'https://testdomain/' . rawurlencode($urlInPath);
+
+        $generator = new \Winter\Storm\Router\UrlGenerator(new RouteCollection, Request::create($url));
+        $baseGenerator = new \Illuminate\Routing\UrlGenerator(new RouteCollection, Request::create($url));
+
+        $this->assertEquals(
+            urldecode($baseGenerator->to($url)),
+            urldecode($generator->to($url))
+        );
+    }
+
+    public function testDoublyEncodedUrlInPathMatchLaravel()
+    {
+        $urlInPath = 'https://testUrlInPath/path?k1=v1&k2';
+        $url = 'https://testdomain/' . rawurlencode(rawurlencode($urlInPath));
+
+        $generator = new \Winter\Storm\Router\UrlGenerator(new RouteCollection, Request::create($url));
+        $baseGenerator = new \Illuminate\Routing\UrlGenerator(new RouteCollection, Request::create($url));
+
+        $this->assertEquals(
+            urldecode($baseGenerator->to($url)),
+            urldecode($generator->to($url))
+        );
+    }
 }