imap: imap-sync - Fix VANISHED response with UID=1

Fixes a bug introduced in 4eb3f6f27, where a UID EXPUNGE 1 command
resulted in a VANSIHED 0:1 response, which is invalid IMAP syntax
(sequence sets must have nonzero values).

diff --git a/src/imap/imap-sync.c b/src/imap/imap-sync.c
index 13b61017870eee6104898e2ea78d053de08ec4af..fc49ae7230a30345983e3a6b1ba6104b86fd0d0f 100644 (file)
--- a/src/imap/imap-sync.c
+++ b/src/imap/imap-sync.c
@@ -430,7 +430,7 @@ static void imap_sync_vanished(struct imap_sync_context *ctx)
                start_uid = 0; prev_uid = 0;
                for (seq = seqs[i].seq1; seq <= seqs[i].seq2; seq++) {
                        mail_set_seq(ctx->mail, seq);
-                       if (prev_uid != ctx->mail->uid - 1) {
+                       if (prev_uid == 0 || prev_uid + 1 != ctx->mail->uid) {
                                if (start_uid != 0) {
                                        if (!comma)
                                                comma = TRUE;