Bug 366320

This bug occurs with the volume applet installed by default on Kubuntu 16.04.1. There doesn't seem to be an obvious way to retrieve the applet version. (As an aside, perhaps add an about screen to the applet configuration window?)

When pulseaudio fails to start / is not running, this applet seems to probe for a connection continuously. This pushes plasmashell CPU usage up to ~100% on one core (on a 4 core setup).

The applet should instead exponentially back-off on trying to reconnect, or at the very least it's retries should be throttled down to no more than 1 a second. 

Personally, I'd prefer it if the applet just gave up after a few tries and wait for a user to explicitly ask it to connect, but I understand why that may be less than ideal as a general solution.

Reproducible: Always

Steps to Reproduce:
1. Create a situation where pulseaudio will refuse to start. For me, I had PULSE_SERVER set to an external server via a pax11publish in one of my startup scripts, and the server is not available.
2. Log into a KDE session.


Actual Results:  
3. Look at CPU usage of plasmashell. Find that it's persistently using up a core.
4. Kill plasmashell and restart it from the command line. Find your screen fills up with pulseaudio failed to connect errors.
5. During this period, the speaker icon remains a dull red. (As another aside, I only realized that the red meant that there was a problem _after_ I managed to fix pulseaudio and saw the usual white icon)

Expected Results:  
A volume control applet should no require me to figure out ways to cool my CPU. That's just not cool.