Handle first function

Author: vmcj

webapp/src/Utils/Utils.php

@@ -413,6 +413,7 @@ public static function hexToForegroundAndBorder(string $rgb): array
         $background = Utils::parseHexColor($rgb);
 
         // Pick a border that's a bit darker.
+        // We explicit keep the alpha channel as-is.
         $darker = $background;
         $darker[0] = max($darker[0] - 64, 0);
         $darker[1] = max($darker[1] - 64, 0);