Revert "Allow alpha in RGBA strings"

This reverts commit 32056e8da0864ed1b62e8342eff0d2cb8f766f3d.

Author: vmcj

webapp/src/Utils/Utils.php

@@ -371,15 +371,11 @@ public static function componentToHex(int $component): string
     /**
      * Convert an RGB triple into a CSS hex color.
      *
-     * @param array{int, int, int}|array{int, int, int, int}  $color
+     * @param array{int, int, int} $color
      */
     public static function rgbToHex(array $color): string
     {
-        $result = '#';
-        for (int i = 0; i<count($color); i++) {
-            $result += static::componentToHex($color[$i]);
-        }
-        return $result;
+        return "#" . static::componentToHex($color[0]) . static::componentToHex($color[1]) . static::componentToHex($color[2]);
     }
 
     /**

webapp/tests/Unit/Utils/UtilsTest.php

@@ -341,8 +341,6 @@ public function testRgbToHex(): void
         self::assertEquals('#000000', Utils::rgbToHex([0, 0, 0]));
         self::assertEquals('#abcdef', Utils::rgbToHex([171, 205, 239]));
         self::assertEquals('#fedcba', Utils::rgbToHex([254, 220, 186]));
-        self::assertEquals('#fedcbaff', Utils::rgbToHex([254, 220, 186, 255]));
-        self::assertEquals('#fedcba00', Utils::rgbToHex([254, 220, 186, 0]));
     }
 
     /**