SingleApplication: Call also QWidget::show on activate
SingleApplication: Call also QWidget::show on activate

Needed if the application is hidden (not only minimized), e.g. for lxqt-runner

pmattern/liblxqt,lxde/liblxqt,pmattern/liblxqt,ThomasVie/liblxqt,ThomasVie/liblxqt,lxde/liblxqt