fix(files): preserve encryptedVersion when copying cache entries

Cache::copyFromCache() rebuilt the target's cache row via
cacheEntryToArray(), which only carried over a boolean `encrypted`
flag and dropped the real `encryptedVersion` count. Since
View::copy() unconditionally calls copyFromCache() after the storage
copy completes, this silently overwrote the correct encryptedVersion
that Encryption::updateEncryptedVersion() had just set, collapsing it
back to 0/1 on every copy of a file whose encryptedVersion was above 1.

cacheEntryToArray() now includes the source entry's encryptedVersion
when it is encrypted. The existing encrypted-to-non-encrypted-storage
override in copyFromCache() also clears encryptedVersion alongside
`encrypted`, since normalizeData() prefers encryptedVersion over
`encrypted` when both are present in the update data.

Signed-off-by: Kent Delante <kent@delante.me>
Assisted-by: ClaudeCode:claude-sonnet-5

Author: leftybournes

lib/private/Files/Cache/Cache.php

@@ -1210,6 +1210,9 @@ public function copyFromCache(ICache $sourceCache, ICacheEntry $sourceEntry, str
 			&& $sourceCache->hasEncryptionWrapper()
 			&& !$this->shouldEncrypt($targetPath)) {
 			$data['encrypted'] = 0;
+			// normalizeData() prefers 'encryptedVersion' over 'encrypted' when both are
+			// set, so it has to be cleared too or the mark above gets ignored
+			unset($data['encryptedVersion']);
 		}
 
 		$fileId = $this->put($targetPath, $data);
@@ -1243,6 +1246,11 @@ private function cacheEntryToArray(ICacheEntry $entry): array {
 		if ($entry instanceof CacheEntry && isset($entry['scan_permissions'])) {
 			$data['permissions'] = $entry['scan_permissions'];
 		}
+
+		if ($entry->isEncrypted() && isset($entry['encryptedVersion'])) {
+			$data['encryptedVersion'] = $entry['encryptedVersion'];
+		}
+
 		return $data;
 	}