always check for unique filename, if a file gets added from outside the mount

point should be adjusted to ne unique again

apps/files_sharing/lib/sharedstorage.php

@@ -517,14 +517,14 @@ class Shared extends \OC\Files\Storage\Common {
 			$parent = dirname($parent);
 		}
 
-		$newMountPoint = \OC\Files\Filesystem::normalizePath($parent . '/' . $mountPoint);
-
-		if($newMountPoint !== $share['file_target']) {
 		$newMountPoint = \OCA\Files_Sharing\Helper::generateUniqueTarget(
-					$newMountPoint,
+				\OC\Files\Filesystem::normalizePath($parent . '/' . $mountPoint),
 				array(),
 				new \OC\Files\View('/' . \OCP\User::getUser() . '/files')
 				);
+
+		if($newMountPoint !== $share['file_target']) {
+
 			self::updateFileTarget($newMountPoint, $share);
 			$share['file_target'] = $newMountPoint;