job timeout should not kill idle task

From the documentation of the timeout attribute:

Limits the duration of a task operation (spooler_open, spooler_process etc.)

So timeout should only count for actual operations, but stop the timer after each operation has ended.

However, if the job has an idle_timeout and the task is idle, the timeout still runs (starting from the last spooler_process() start) and kills an idle task which results in an error.