Allow unlabeling self

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

@@ -3601,13 +3601,12 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             Bundle args = new Bundle();
             args.putLong("id", message.id);
             args.putLong("account", message.account);
-            args.putString("exclude", message.folderName);
+            args.putString("self", message.folderName);
 
             new SimpleTask<String[]>() {
                 @Override
                 protected String[] onExecute(Context context, Bundle args) {
                     long account = args.getLong("account");
-                    String exclude = args.getString("exclude");
 
                     DB db = DB.getInstance(context);
                     List<EntityFolder> folders = db.folder().getFolders(account, true, true);
@@ -3615,7 +3614,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     List<String> result = new ArrayList<>();
                     if (folders != null)
                         for (EntityFolder folder : folders)
-                            if (EntityFolder.USER.equals(folder.type) && !exclude.equals(folder.name))
+                            if (EntityFolder.USER.equals(folder.type))
                                 result.add(folder.name);
 
                     Collator collator = Collator.getInstance(Locale.getDefault());
@@ -6209,10 +6208,13 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         @Override
         public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
             final long id = getArguments().getLong("id");
+            String self = getArguments().getString("self");
             String[] labels = getArguments().getStringArray("labels");
             final String[] folders = getArguments().getStringArray("folders");
 
             List<String> l = new ArrayList<>();
+            if (self != null)
+                l.add(self);
             if (labels != null)
                 l.addAll(Arrays.asList(labels));
 

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

@@ -695,10 +695,39 @@ class Core {
 
     private static void onLabel(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, IMAPStore istore, IMAPFolder ifolder, State state) throws JSONException, MessagingException, IOException {
         // Set/clear Gmail label
+        // Gmail does not push label changes
         String label = jargs.getString(0);
         boolean set = jargs.getBoolean(1);
 
-        // Gmail does not push label changes
+        DB db = DB.getInstance(context);
+
+        if (!set && label.equals(folder.name)) {
+            // Prevent deleting message
+            EntityFolder archive = db.folder().getFolderByType(message.account, EntityFolder.ARCHIVE);
+            if (archive == null)
+                throw new IllegalArgumentException("label/archive");
+
+            Message[] imessages;
+            Folder iarchive = istore.getFolder(archive.name);
+            try {
+                iarchive.open(Folder.READ_ONLY);
+                imessages = ifolder.search(new MessageIDTerm(message.msgid));
+            } finally {
+                if (iarchive.isOpen())
+                    iarchive.close();
+            }
+
+            if (imessages != null && imessages.length > 0)
+                try {
+                    Message imessage = ifolder.getMessageByUID(message.uid);
+                    imessage.setFlag(Flags.Flag.DELETED, true);
+                    ifolder.expunge();
+                } catch (MessagingException ex) {
+                    Log.w(ex);
+                }
+            else
+                throw new IllegalArgumentException("label/delete");
+        } else {
             try {
                 Message imessage = ifolder.getMessageByUID(message.uid);
                 if (imessage instanceof GmailMessage)
@@ -706,8 +735,8 @@ class Core {
             } catch (MessagingException ex) {
                 Log.w(ex);
             }
+        }
 
-        DB db = DB.getInstance(context);
         try {
             db.beginTransaction();