From 6ab31c15b79879200fa67ae040a35847a823aa25 Mon Sep 17 00:00:00 2001
From: Mechiel Lukkien <mechiel@ueber.net>
Date: Sat, 29 Mar 2025 18:28:33 +0100
Subject: [PATCH] imapserver: actually announce PREVIEW extension

---
 imapclient/protocol.go | 1 +
 imapserver/server.go   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/imapclient/protocol.go b/imapclient/protocol.go
index 8cf422f..bd6978c 100644
--- a/imapclient/protocol.go
+++ b/imapclient/protocol.go
@@ -40,6 +40,7 @@ const (
 	CapListMetadata     Capability = "LIST-METADTA"       // ../rfc/9590:73
 	CapMultiAppend      Capability = "MULTIAPPEND"        // ../rfc/3502:33
 	CapReplace          Capability = "REPLACE"            // ../rfc/8508:155
+	CapPreview          Capability = "PREVIEW"            // ../rfc/8970:114
 )
 
 // Status is the tagged final result of a command.
diff --git a/imapserver/server.go b/imapserver/server.go
index abdf24f..343db17 100644
--- a/imapserver/server.go
+++ b/imapserver/server.go
@@ -180,6 +180,7 @@ var serverCapabilities = strings.Join([]string{
 	"LIST-METADATA",                   // ../rfc/9590
 	"MULTIAPPEND",                     // ../rfc/3502
 	"REPLACE",                         // ../rfc/8508
+	"PREVIEW",                         // ../rfc/8970:114
 	// "COMPRESS=DEFLATE", // ../rfc/4978, disabled for interoperability issues: The flate reader (inflate) still blocks on partial flushes, preventing progress.
 }, " ")