Timer should resume not reset on proximity out

[Christian Giordano]

With the current implementation, it looks like the timer is reset every time the pointer exits from the proximity area. This creates a paradox because it makes the ephemeral notifications more persistent the more the user interacts with the content underneath them.

Proposed solution:

- Pause the timer when the pointer enters in the proximity area
- Resume (not reset) the timer when the pointer exits the proximity area

[Mirco Müller (macslow)]

The full table of durations (https://wiki.ubuntu.com/NotifyOSD#Bubble_behavior) has not been implemented yet, as it needs "pause-able" timers, which are not available in glib. There was effort started on implementing those, but I was pulled away from that, so had to do what I could without them.

[Christian Giordano (nuthinking)]

Can't you save and compare time stamps?