Preset labels

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

@@ -708,8 +708,13 @@ class Core {
         }
 
         DB db = DB.getInstance(context);
-        List<EntityMessage> messages = db.message().getMessagesByMsgId(message.account, message.msgid);
-        if (messages != null)
+        try {
+            db.beginTransaction();
+
+            List<EntityMessage> messages = db.message().getMessagesByMsgId(message.account, message.msgid);
+            if (messages == null)
+                return;
+
             for (EntityMessage m : messages) {
                 EntityFolder f = db.folder().getFolder(m.folder);
                 if (!label.equals(f.name) && m.setLabel(label, set)) {
@@ -717,6 +722,11 @@ class Core {
                     db.message().setMessageLabels(m.id, DB.Converters.fromStringArray(m.labels));
                 }
             }
+
+            db.setTransactionSuccessful();
+        } finally {
+            db.endTransaction();
+        }
     }
 
     private static void onAdd(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, IMAPStore istore, IMAPFolder ifolder, State state) throws MessagingException, IOException {

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

@@ -154,6 +154,13 @@ public class EntityOperation {
 
                 db.message().setMessageKeywords(message.id, DB.Converters.fromStringArray(keywords.toArray(new String[0])));
 
+            } else if (LABEL.equals(name)) {
+                String label = jargs.getString(0);
+                boolean set = jargs.getBoolean(1);
+
+                if (message.setLabel(label, set))
+                    db.message().setMessageLabels(message.id, DB.Converters.fromStringArray(message.labels));
+
             } else if (MOVE.equals(name)) {
                 // Parameters:
                 // 0: target folder