Steps to reproduce:

1. use update manager to install updates that require a restart
2. after installing the updates, update manager asks whether to restart now or later: select restart now
3. realize you have unsaved work, so from the additional restart confirmation dialog that pops up, select ”cancel”

What I expect to happen
For the restart to get cancelled

What happens instead
A restart; there goes your unsaved work

Further info
I can’t remember if I’ve tried to approve the restart from that final dialog instead of cancelling it, so I don’t know if that would cause the restart to go ahead too (which would be expected), or if the buttons have their labels switched.