If returning a Promise from from a sub transaction, parent transaction will abort

[dfahlander]

If returning a Promise from from a sub transaction, parent transaction will abort in the middle of it's operations as examplified below:

db.transaction('rw', db.someTable, function (){
    db.someTable.get(1).then(function(x){
        db.someTable.get(1).then(function(x){
        }).catch(function (err) {
            // Will come here because the sub transaction below returns a promise.
        });
    });
    db.transaction ('rw', db.someTable, function () {
        return db.someTable.get(1);
    };
});