Warn on non-opaque colors for problems

Author: vmcj

webapp/src/Utils/Utils.php

@@ -350,12 +350,16 @@ public static function convertToColor(string $hex): ?string
     public static function parseHexColor(string $hex): array
     {
         // Source: https://stackoverflow.com/a/21966100
-        $length = (strlen($hex) - 1) / 3;
+        $length = (strlen($hex) - 1) / 4;
+        if (((strlen($hex) - 1) % 3) == 0) {
+            $length = (strlen($hex) - 1) / 3;
+        }
         $fact = [17, 1, 0.062272][$length - 1];
         return [
             (int)round(hexdec(substr($hex, 1, $length)) * $fact),
             (int)round(hexdec(substr($hex, 1 + $length, $length)) * $fact),
-            (int)round(hexdec(substr($hex, 1 + 2 * $length, $length)) * $fact)
+            (int)round(hexdec(substr($hex, 1 + 2 * $length, $length)) * $fact),
+            (int)round(hexdec(substr($hex, 1 + 3 * $length, $length)) * $fact)
         ];
     }