Fixed move message ID

app/src/main/java/eu/faircode/email/Core.java

@@ -464,21 +464,30 @@ class Core {
         // Move message
         DB db = DB.getInstance(context);
 
-        Message imessage = ifolder.getMessageByUID(message.uid);
-        if (imessage == null)
-            throw new MessageRemovedException();
-
         // Get arguments
         long id = jargs.getLong(0);
         boolean autoread = (jargs.length() > 1 && jargs.getBoolean(1));
         Long newid = (jargs.length() > 2 && !jargs.isNull(2) ? jargs.getLong(2) : null);
 
+        // Get source message
+        Message imessage = ifolder.getMessageByUID(message.uid);
+        if (imessage == null)
+            throw new MessageRemovedException();
+
         // Get target folder
         EntityFolder target = db.folder().getFolder(id);
         if (target == null)
             throw new FolderNotFoundException();
         IMAPFolder itarget = (IMAPFolder) istore.getFolder(target.name);
 
+        // Get message ID
+        String msgid;
+        if (copy || message.msgid == null) {
+            msgid = EntityMessage.generateMessageId();
+            Log.i(target.name + " generated message id=" + msgid);
+        } else
+            msgid = message.msgid;
+
         // Serialize source message
         ByteArrayOutputStream bos = new ByteArrayOutputStream();
         imessage.writeTo(bos);
@@ -487,13 +496,6 @@ class Core {
         ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
         Message icopy = new MimeMessage(isession, bis);
 
-        // Make sure the message has a message ID
-        if (copy || message.msgid == null) {
-            String msgid = EntityMessage.generateMessageId();
-            Log.i(target.name + " generated message id=" + msgid);
-            icopy.setHeader("Message-ID", msgid);
-        }
-
         try {
             // Needed to read flags
             itarget.open(Folder.READ_WRITE);
@@ -513,6 +515,8 @@ class Core {
                 if (itarget.getPermanentFlags().contains(Flags.Flag.DRAFT))
                     icopy.setFlag(Flags.Flag.DRAFT, true);
 
+            icopy.setHeader("Message-ID", msgid);
+
             // Append target
             long uid = append(istore, itarget, (MimeMessage) icopy);
             if (newid != null) {
@@ -520,6 +524,10 @@ class Core {
                 db.message().setMessageUid(newid, uid);
             }
 
+            // Fixed timing issue of at least Courier based servers
+            itarget.close(false);
+            itarget.open(Folder.READ_WRITE);
+
             // Some providers, like Gmail, don't honor the appended seen flag
             if (itarget.getPermanentFlags().contains(Flags.Flag.SEEN)) {
                 boolean seen = (autoread || message.ui_seen);
@@ -671,10 +679,6 @@ class Core {
         } else
             ifolder.appendMessages(new Message[]{imessage});
 
-        // Fixed timing issue of at least Courier based servers
-        ifolder.close(false);
-        ifolder.open(Folder.READ_WRITE);
-
         if (uid <= 0) {
             Log.i("Searching for appended msgid=" + msgid);
             Message[] messages = ifolder.search(new MessageIDTerm(msgid));