fix: ensure nested mount points are handled in the correct order

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/View.php

@@ -1475,6 +1475,13 @@ class View {
 
 		//add a folder for any mountpoint in this directory and add the sizes of other mountpoints to the folders
 		$mounts = Filesystem::getMountManager()->findIn($path);
+
+		// make sure nested mounts are sorted after their parent mounts
+		// otherwise doesn't propagate the etag across storage boundaries correctly
+		usort($mounts, function (IMountPoint $a, IMountPoint $b) {
+			return $a->getMountPoint() <=> $b->getMountPoint();
+		});
+
 		$dirLength = strlen($path);
 		foreach ($mounts as $mount) {
 			$mountPoint = $mount->getMountPoint();