bug #798 [Live] Fix checksum calculation for deeply nested data (1ed)

This PR was merged into the 2.x branch.

Discussion
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[Live] Fix checksum calculation for deeply nested data

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tickets       | -
| License       | MIT

For a consistent checksum we need to sort the whole input.

Commits
-------

5b0b862 [Live] Fix checksum calculation for deeply nested data

src/LiveComponent/src/LiveComponentHydrator.php

@@ -243,7 +243,7 @@ private static function coerceStringValue(string $value, string $type, bool $all
     private function calculateChecksum(array $dehydratedPropsData): ?string
     {
         // sort so it is always consistent (frontend could have re-ordered data)
-        ksort($dehydratedPropsData);
+        $this->recursiveKeySort($dehydratedPropsData);
 
         return base64_encode(hash_hmac('sha256', json_encode($dehydratedPropsData), $this->secret, true));
     }
@@ -549,4 +549,14 @@ private function combineAndValidateProps(array $props, array $updatedPropsFromPa
 
         return $dehydratedOriginalProps;
     }
+
+    private function recursiveKeySort(array &$data): void
+    {
+        foreach ($data as &$value) {
+            if (\is_array($value)) {
+                $this->recursiveKeySort($value);
+            }
+        }
+        ksort($data);
+    }
 }