Merge pull request #47095 from nextcloud/fix/theming/cache-buster-on-…

…upgrade

fix(theming): make cache buster depend on the app version

apps/theming/lib/Util.php

@@ -311,12 +311,14 @@ public function getCacheBuster(): string {
 		if (!is_null($user)) {
 			$userId = $user->getUID();
 		}
+		$serverVersion = \OC_Util::getVersionString();
+		$themingAppVersion = $this->appManager->getAppVersion('theming');
 		$userCacheBuster = '';
 		if ($userId) {
 			$userCacheBusterValue = (int)$this->config->getUserValue($userId, 'theming', 'userCacheBuster', '0');
 			$userCacheBuster = $userId . '_' . $userCacheBusterValue;
 		}
 		$systemCacheBuster = $this->config->getAppValue('theming', 'cachebuster', '0');
-		return substr(sha1($userCacheBuster . $systemCacheBuster), 0, 8);
+		return substr(sha1($serverVersion . $themingAppVersion . $userCacheBuster . $systemCacheBuster), 0, 8);
 	}
 }