Code review comment for lp:~zsombi/ubuntu-ui-toolkit/textinputs-stay-disabled-when-reenabled

How about using http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#inherits instead of qobject_cast?
It seems more adapted to the purpose of the checks in QuickUtils::activeFocus.
Feel free to ignore this comment.