There are funny things happening when you press the restbreak button (the cup 
in the wr window)

- My restbreak timer is reset before I fully take the break (i.e. if I 
click "postpone", I can work for 20 minutes again.

- The restbreak timer is stopped (as if I were idle - innocent until proven 
guilty, I assume), but the micropause timer is not. It keeps running for 
another five seconds.

- I thought I saw one time, where the restbreak timer was not reset to 20, 
where the restbreak timer kept running too, in spite of me having a break.

- Either way, The progress bar in the restbreak window does not start running 
until I'm fully Idle (i.e. when the micropause timer stops)

Whoops... Belay that third point.
Even if the restbreak timer is not reset, it is at least stopped. In this case, 
too, however, the micropause timer is not stopped.

I hope most things are fixed...I really made a mess of it...

> - Either way, The progress bar in the restbreak window does not start running 
> until I'm fully Idle (i.e. when the micropause timer stops)

Yes. See bug #96. comments welcome.