only Plasma::ClockApplet uses the Plasma::Calendar class and it disables
automatic updates (because the date comes from data engine). also due to
7819796c55 the date is updated once a second
which was updating the currently selected date thus interfering with date
selection every second so the check that was removed in
d7d63a156b had to be brought back
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
QCalendarWidget already does handle some, including date input via number
keys (Qt::Key_0 to Qt::Key_9)
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>