Merge pull request #702 from atk4/feature/only-prepend-namespace-for-…

…known-classes

Only prepend namespace for known classes

src/App.php

@@ -384,7 +384,33 @@ public function addStyle($style)
      */
     public function normalizeClassNameApp($name)
     {
-        return '\\'.__NAMESPACE__.'\\'.$name;
+        /**
+         * @see https://agile-core.readthedocs.io/en/develop/factory.html#FactoryTrait::normalizeClassName
+         * replacing / to \
+         */
+        $checkClass = str_replace('/', '\\', $name);
+
+        // check FQCN existence without prepend \\
+        // @case $name = "\\externalNamespace\\className"
+        if (class_exists($checkClass)) {
+            return $checkClass;
+        }
+
+        $checkClass = '\\'.$checkClass;
+        // check FQCN existence prepending \
+        // @case $name = "externalNamespace\\className"
+        if (class_exists($checkClass)) {
+            return $checkClass;
+        }
+
+        $checkClass = '\\'.__NAMESPACE__.$checkClass;
+        // check FQCN existence prepending FQNS \atk4\ui
+        // @case $name = "FormField/AutoComplete"
+        if (class_exists($checkClass)) {
+            return $checkClass;
+        }
+
+        return $name;
     }
 
     /**