Small change

app/src/main/java/com/sun/mail/imap/IMAPFolder.java

@@ -3644,7 +3644,7 @@ public class IMAPFolder extends Folder implements UIDFolder, ResponseHandler {
 		long[] luid = UIDSet.toArray(uidset);
 		Message[] msgs = createMessagesForUIDs(luid);
 		for (Message m : msgs) {
-			// Avoid creating seqnums
+			// Avoid creating/updating seqnums
 		    if (m != null)
 			((IMAPMessage)m).setExpunged(true);
 		}

app/src/main/java/com/sun/mail/imap/MessageCache.java

@@ -218,7 +218,7 @@ public class MessageCache {
 	while (oldnum <= size) {
 	    // is message expunged?
 		IMAPMessage m = getMessage(oldnum);
-	    if (seqnumOf(oldnum) <= 0 || (m !=null && m.isExpunged())) {
+	    if (seqnumOf(oldnum) <= 0 || (m != null && m.isExpunged())) {
 		mlist.add(m);
 	    } else {
 		// keep this message