Prevent firing the "change" event twice (#286)

Prevent firing the "change" event twice in Google Chrome

src/Selenium2Driver.php

@@ -683,7 +683,20 @@ public function setValue($xpath, $value)
         }
 
         $element->postValue(array('value' => array($value)));
-        $this->trigger($xpath, 'change');
+        // Remove the focus from the element if the field still has focus in
+        // order to trigger the change event. By doing this instead of simply
+        // triggering the change event for the given xpath we ensure that the
+        // change event will not be triggered twice for the same element if it
+        // has lost focus in the meanwhile. If the element has lost focus
+        // already then there is nothing to do as this will already have caused
+        // the triggering of the change event for that element.
+        $script = <<<JS
+var node = {{ELEMENT}};
+if (document.activeElement === node) {
+  document.activeElement.blur();
+}
+JS;
+        $this->executeJsOnElement($element, $script);
     }
 
     /**