From 829f1243fbe8f7ff5844693d1a6ff49b6e9a2f74 Mon Sep 17 00:00:00 2001
From: Manos Pitsidianakis <el13635@mail.ntua.gr>
Date: Wed, 30 Dec 2020 16:19:15 +0200
Subject: [PATCH] melib/imap: fix invalid FETCH edge case

If mailbox was empty, this FETCH would request "0:*" which is an invalid
message set since message sequence numbers start with 1.
---
 melib/src/backends/imap/watch.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/melib/src/backends/imap/watch.rs b/melib/src/backends/imap/watch.rs
index 3c4ad3db..772b5a82 100644
--- a/melib/src/backends/imap/watch.rs
+++ b/melib/src/backends/imap/watch.rs
@@ -345,7 +345,7 @@ pub async fn examine_updates(
             conn.send_command(
                 format!(
                     "FETCH {}:* (UID FLAGS ENVELOPE BODY.PEEK[HEADER.FIELDS (REFERENCES)] BODYSTRUCTURE)",
-                    mailbox.exists.lock().unwrap().len()
+                    std::cmp::max(mailbox.exists.lock().unwrap().len(), 1)
                 )
                 .as_bytes(),
             )