the plasma frame applet for example uses zero time (QTime(0, 0, 0), not
invalid time) as a special for case for "never" (i.e. don't update) so
having this feature will make KTimeEdit even more suitable for timers (that
ofcourse has to be handled by the application or library, zero time timers
are a thing)
also min/max now allows to set lower seconds (for example) when the minute
is not zero instead of just restricting the seconds value to a hard-minumum
altough that makes me think a step feature may be needed (e.g. to now allow
intervals less than two seconds with minimum of one second)
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>