Bump minimum required version of behat/mink to ~1.8 and symfony/panth…

…er to ~0.7

* switchToIFrame requires int, WebDriverElement or element and not string anymore
as of php-webdriver/webdriver 1.8 and symfony/panther 0.7 which uses w3c compatibility

composer.json

@@ -18,8 +18,8 @@
   ],
   "require": {
     "php": ">=7.1",
-    "behat/mink": "^1.7.1@dev",
-    "symfony/panther": "~0.4,<0.7",
+    "behat/mink": "~1.8",
+    "symfony/panther": "~0.7",
     "ext-dom": "*"
   },
   "require-dev": {

src/PantherDriver.php

@@ -212,8 +212,11 @@ public function switchToIFrame($name = null)
     {
         if (null === $name) {
             $this->client->switchTo()->defaultContent();
+        } elseif ($name) {
+            $iFrameElement = $this->getCrawlerElement($this->getFilteredCrawler(\sprintf("//iframe[@name='%s']", $name)));
+            $this->client->switchTo()->frame($iFrameElement);
         } else {
-            $this->client->switchTo()->frame($name);
+            $this->client->switchTo()->frame(null);
         }
         $this->client->refreshCrawler();
     }