void MainWindow::on_actionShowSmallIcons_toggled(bool b)
{
    ui->mainToolBar->setIconSize(b? QSize(16, 16) : QSize());
    Settings.setSmallIcons(b);
}
void MainWindow::on_actionShowSmallIcons_toggled(bool b)
{
    ui->mainToolBar->setIconSize(b? QSize(16, 16) : QSize());
    Settings.setSmallIcons(b);
}