Notifications

This feature allows server side applications to send system notifications (aka notifications bubbles) to the client.

It is supported on all platforms and controlled by the notifications configuration option.

Platform support

MS Windows use system bubbles - you may need to configure your system to show the xpra system tray icon and / or the bubbles
MacOS clients use a custom GTK window since there was no system API until OSX 10.8.x (this should be replaced with native code at some point)
posix clients can use python-notify or python-dbus (the exact name of the packages required vary)

Debugging

start both the client and server with the debug command line flags: -d notify,dbus
you can also test notifications forwarding using the dbus interface or xpra control, ie:
```
xpra control :100 send-notification "hello" "world" "*"
```
will send the message to all clients.

Screenshots

MS Windows XP:

MacOS 10.10.x:

Gnome-shell: