Processes listing should give indication that it is updating

Submitted by Sébastien Bacher @seb128

Link to original bug (#382201)

Description

That bug has been opened on https://launchpad.net/distros/ubuntu/+source/gnome-system-monitor/+bug/71164

"When viewing a fairly consistent/static Process list in the GNOME System Monitor it is hard to know that the list is actually being updated in real-time at ~1Hz.

System Monitor should give some indication that the date is updating. On the command line, 'top' achieves the 'throbber' effect by showing the current time (HH:mm:ss) and uptime. 'watch' achieves this effect by showing the current date and time.

Both tools also show the update-frequency; perhaps this could be shown as a combo-box."

Version: 2.17.x