Use write permission when possible

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Service/DocumentService.php

@@ -405,7 +405,13 @@ public function getFileById($fileId, $userId = null): Node {
 			throw new NotFoundException();
 		}
 
-		return $files[0];
+		// Workaround to always open files with edit permissions if multiple occurences of
+		// the same file id are in the user home, ideally we should also track the path of the file when opening
+		usort($files, function (Node $a, Node $b) {
+			return ($a->getPermissions() & Constants::PERMISSION_UPDATE) < ($b->getPermissions() & Constants::PERMISSION_UPDATE);
+		});
+
+		return array_shift($files);
 	}
 
 	/**