Clear rules with transaction

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

@@ -456,12 +456,12 @@ public class FragmentRules extends FragmentBase {
                 boolean all = args.getBoolean("all");
 
                 DB db = DB.getInstance(context);
+                try {
+                    db.beginTransaction();
 
-                if (all) {
+                    if (all)
                         db.rule().deleteRules(fid);
-                    return null;
+                    else {
-                }
-
                         EntityFolder folder = db.folder().getFolder(fid);
                         if (folder == null)
                             return null;
@@ -481,6 +481,12 @@ public class FragmentRules extends FragmentBase {
                             if (type == TYPE_MOVE && target == junk.id)
                                 db.rule().deleteRule(rule.id);
                         }
+                    }
+
+                    db.setTransactionSuccessful();
+                } finally {
+                    db.endTransaction();
+                }
 
                 return null;
             }