Added flag to not break Flight users code

flight/template/View.php

@@ -20,6 +20,8 @@ class View
     /** File extension. */
     public string $extension = '.php';
 
+    public bool $preserveVars = true;
+
     /**
      * View variables.
      *
@@ -122,7 +124,7 @@ class View
 
         include $this->template;
 
-        if ($data !== null) {
+        if ($this->preserveVars === false && $data !== null) {
             foreach (array_keys($data) as $variable) {
                 unset($this->vars[$variable]);
             }

tests/FlightTest.php

@@ -22,6 +22,7 @@ class FlightTest extends TestCase
         $_REQUEST = [];
         Flight::init();
         Flight::setEngine(new Engine());
+        Flight::set('flight.views.path', __DIR__ . '/views');
     }
 
     protected function tearDown(): void
@@ -355,9 +356,9 @@ class FlightTest extends TestCase
         $this->expectOutputString('Thisisaroutewithhtml');
     }
 
-    public function testItDoesNotKeepThePreviousStateOfOneViewComponentUsingFlightRender(): void
+    public function testDoesNotPreserveVarsWhenFlagIsDisabled(): void
     {
-        Flight::set('flight.views.path', __DIR__ . '/views');
+        Flight::view()->preserveVars = false;
 
         $this->expectOutputString("<div>Hi</div>\n<div></div>\n");
         Flight::render('myComponent', ['prop' => 'Hi']);
@@ -370,4 +371,11 @@ class FlightTest extends TestCase
 
         restore_error_handler();
     }
+
+    public function testKeepThePreviousStateOfOneViewComponentByDefault(): void
+    {
+        $this->expectOutputString("<div>Hi</div>\n<div>Hi</div>\n");
+        Flight::render('myComponent', ['prop' => 'Hi']);
+        Flight::render('myComponent');
+    }
 }

tests/ViewTest.php

@@ -153,8 +153,10 @@ class ViewTest extends TestCase
         );
     }
 
-    public function testItDoesNotKeepThePreviousStateOfOneViewComponent(): void
+    public function testDoesNotPreserveVarsWhenFlagIsDisabled(): void
     {
+        $this->view->preserveVars = false;
+
         $this->expectOutputString("<div>Hi</div>\n<div></div>\n");
         $this->view->render('myComponent', ['prop' => 'Hi']);
 
@@ -166,4 +168,11 @@ class ViewTest extends TestCase
 
         restore_error_handler();
     }
+
+    public function testKeepThePreviousStateOfOneViewComponentByDefault(): void
+    {
+        $this->expectOutputString("<div>Hi</div>\n<div>Hi</div>\n");
+        $this->view->render('myComponent', ['prop' => 'Hi']);
+        $this->view->render('myComponent');
+    }
 }