I believe having the Print button
change into a Restart button
is a very BAD design !
When using the Pause button,
the Print button is also being changed into a Restart button.
This cause a lot of trouble and we do not need a Restart button.
We can always use the Cancel button
and then Print button to restart the print job.
Many People have been hurt by this BAD design !
If many people think they need the Restart button
I suggest moving the Restart button
up to the top menu of buttons.
And so would be a lot better not be changing
the Print button into a Restart button
that is next to the Pause / Resume button.