Fix bug when writing ampersand characters

Author: olivervogel

src/FontProcessor.php

@@ -48,6 +48,9 @@ public function boxSize(string $text, FontInterface $font): SizeInterface
      */
     public function textToVipsImage(string $text, FontInterface $font, ?ColorInterface $color = null): VipsImage
     {
+        // VipsImage::text() can only handle certain characters as HTML entities
+        $text = htmlentities($text);
+
         if (!is_null($color)) {
             $text = '<span foreground="' . $color->toHex('#') . '">' . $text . '</span>';
         }

tests/Unit/Modifiers/TextModifierTest.php

@@ -20,6 +20,6 @@ public function testApply(): void
         $font->setWrapWidth(300);
         $font->setAlignment('center');
         $font->setLineHeight(2);
-        $image->modify(new TextModifier('ABC', new Point(150, 150), $font));
+        $image->modify(new TextModifier('ABC & D', new Point(150, 150), $font));
     }
 }