Fix mark messages seen

If a chat had a last message the persistence call `Chat()` would not
decode `LastMessage` correctly.
This commit fixes the issue.

VERSION

@@ -1 +1 @@
-0.56.7
+0.56.8

protocol/persistence.go

@@ -277,6 +277,7 @@ func (db sqlitePersistence) Chat(chatID string) (*Chat, error) {
 		chat                     Chat
 		encodedMembers           []byte
 		encodedMembershipUpdates []byte
+		lastMessageBytes         []byte
 	)
 
 	err := db.db.QueryRow(`
@@ -305,7 +306,7 @@ func (db sqlitePersistence) Chat(chatID string) (*Chat, error) {
 		&chat.DeletedAtClockValue,
 		&chat.UnviewedMessagesCount,
 		&chat.LastClockValue,
-		&chat.LastMessage,
+		&lastMessageBytes,
 		&encodedMembers,
 		&encodedMembershipUpdates,
 		&chat.Muted,
@@ -328,6 +329,15 @@ func (db sqlitePersistence) Chat(chatID string) (*Chat, error) {
 			return nil, err
 		}
 
+		// Restore last message
+		if lastMessageBytes != nil {
+			message := &Message{}
+			if err = json.Unmarshal(lastMessageBytes, message); err != nil {
+				return nil, err
+			}
+			chat.LastMessage = message
+		}
+
 		return &chat, nil
 	}
 

protocol/persistence_test.go

@@ -514,3 +514,18 @@ func TestMessagesAudioDurationMsNull(t *testing.T) {
 	require.NoError(t, err)
 	require.Len(t, m, 1)
 }
+
+func TestSaveChat(t *testing.T) {
+	db, err := openTestDB()
+	require.NoError(t, err)
+	p := sqlitePersistence{db: db}
+
+	chat := CreatePublicChat("test-chat", &testTimeSource{})
+	chat.LastMessage = &Message{}
+	err = p.SaveChat(chat)
+	require.NoError(t, err)
+
+	retrievedChat, err := p.Chat(chat.ID)
+	require.NoError(t, err)
+	require.Equal(t, &chat, retrievedChat)
+}