Improvements to new system tray panel

[Bastián Díaz <diaz bastian openmailbox org>]

Hello, from 3.16 I like the design approach used to address the problem 
of legacy tray icons.

I am now convinced that should not exist, but there are applications 
that use them for many reasons and we must give users a way to work with 
that.

I have written some reports of improvement:
https://bugzilla.gnome.org/show_bug.cgi?id=748622
https://bugzilla.gnome.org/show_bug.cgi?id=756757

I have other notions from the user's perspective that could be useful, 
but do not know the operating system icons and how viable are performing 
in gnome-shell.

1. Show tray icon when an application is notified.
Some applications show a notification indicator in tray icon. It would 
be very useful to show the panel that happens every time (similar to the 
behavior when an open an application using the tray icon).

2. Show contextual information status icon a popover-style design.
It is more aesthetic, but it helps to integrate this feature to the 
modern design of gnome.
 ---^----
|  xxx  |
 -------

If you believe it is possible, could generate new reports to improve 
monitoring.

Finally, let me mention something that is distantly related to the 
operation of the tray icon, but can be useful.
It would be interesting to hide the window when you double-click in the 
window title/header bar by default.

Cheers
--
Bastián Dḯaz