Retroactively stop timer upon idle

[gillegra]

This might be only feasible in a desktop app. It would be great if it can detect when I have been inactive for 5 minutes and then when I become active again a pop-up asks if I want to stop the timer back at the time that I went inactive. It could give me options to stop the timer back then, or to stop the timer back then and resume the timer now, or stuff like that.

Too many times I leave a time of running and forget to stop when I need to, but then I don't remember what time I should have stopped it at.