Fix folder size contained in S3 buckets

If 'filesystem_check_changes' was set to never, the cached size was alway set to -1 (Pending) on every access

Signed-off-by: Louis Chemineau <louis@chmn.me>

apps/files_external/lib/Lib/Storage/AmazonS3.php

@@ -385,13 +385,14 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 		try {
 			$stat = [];
 			if ($this->is_dir($path)) {
-				//folders don't really exist
-				$stat['size'] = -1; //unknown
-				$stat['mtime'] = time();
 				$cacheEntry = $this->getCache()->get($path);
-				if ($cacheEntry instanceof CacheEntry && $this->getMountOption('filesystem_check_changes', 1) !== 1) {
+				if ($cacheEntry instanceof CacheEntry) {
 					$stat['size'] = $cacheEntry->getSize();
 					$stat['mtime'] = $cacheEntry->getMTime();
+				} else {
+					// Use dummy values
+					$stat['size'] = -1; // Pending
+					$stat['mtime'] = time();
 				}
 			} else {
 				$stat['size'] = $this->getContentLength($path);
@@ -406,6 +407,10 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 		}
 	}
 
+	public function hasUpdated($path, $time) {
+		return $this->getMountOption('filesystem_check_changes', 1) === 1 || parent::hasUpdated($path, $time);
+	}
+
 	/**
 	 * Return content length for object
 	 *