Notification Area panel applet

[John Jason Jordan]

On Wed, 28 Mar 2012 02:46:11 +0200
suvayu ali <fatkasuvayu+linux at gmail.com> dijo:

>On Wed, Mar 28, 2012 at 02:27, John Jason Jordan <johnxj at comcast.net>
>wrote:
>> In other words, it knew I
>> wanted to "clear all known applications" from a setting in a config
>> file somewhere. I want to nuke this config file to put it back to the
>> original settings, but I can't find any config file for it.
>
>I think its the other way round. As you use it and new applications
>use the tray, they get added and the applet "remembers" them. After
>first use, you can select what to show and what to hide again.

I think we have miscommunicated. I mean the Notification Area applet,
not the Window Buttons applet. The Notification area only shows icons
for a handful of system-type utilities, like network manager, bluetooth
manager, volume control, and so on. Most applications never use the
Notification area at all, whether running or not - for example,
Firefox, LibreOffice, mail client, etc.

Before clicking on the Clear Known Applications button there was a long
list of ~20 tools, with a check box next to each one if I want to hide
the tool. Not that the check boxes worked reliably, but they were
there. After clicking on the button only three tools are listed,
including one that is not hidden, yet still does not appear in the
Notification Area. 

The whole applet is messed up. App icons appear in the Notification Area
even if the Hide box is checked, app icons appear even if not in the
original list of known applications, app icons fail to appear even if
not checked as hidden, and now I can't get the original list to appear.
At the moment I have lost the volume control icon and it is not
listed in the list of known applications (after clicking on the Clear
Known Applications button). I want to nuke the configuration file for
the Notification Area applet and start over from scratch. But where are
the configurations for the Notification Area applet? Where does it get
its list of known applications?