Fix folder sync state / deleting operations

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

@@ -228,7 +228,11 @@ public class AdapterOperation extends RecyclerView.Adapter<AdapterOperation.View
                             if (operation == null)
                                 return null;
 
-                            db.operation().deleteOperation(operation.id);
+                            if (db.operation().deleteOperation(operation.id) > 0)
+                                operation.cleanup(context, false);
+
+                            if (EntityOperation.SYNC.equals(operation.name))
+                                db.folder().setFolderSyncState(operation.folder, null);
 
                             db.folder().setFolderError(operation.folder, null);
                             if (operation.message != null)

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

@@ -204,10 +204,14 @@ public class FragmentOperations extends FragmentBase {
 
                                         for (EntityOperation op : ops) {
                                             EntityLog.log(context, "Deleting operation=" + op.id + ":" + op.name + " error=" + op.error);
+
                                             if (db.operation().deleteOperation(op.id) > 0) {
                                                 op.cleanup(context, false);
                                                 deleted++;
                                             }
+
+                                            if (EntityOperation.SYNC.equals(op.name))
+                                                db.folder().setFolderSyncState(op.folder, null);
                                         }
 
                                         db.setTransactionSuccessful();

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

@@ -426,6 +426,8 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
 
                             for (EntityFolder folder : db.folder().getFolders(accountNetworkState.accountState.id, false, false)) {
                                 db.folder().setFolderState(folder.id, null);
+                                if (db.operation().getOperationCount(folder.id, EntityOperation.SYNC) == 0)
+                                    db.folder().setFolderSyncState(folder.id, null);
                                 db.folder().setFolderPollCount(folder.id, 0);
                             }