Check Notification Server Abilities before sending Actions

[John Steeves]

I have installed Noise from the elementary OS trusty ppa (Stable) in Ubuntu 15.04, and the libsqlheavy as a .deb from the Utopic repositories (from here: http://packages.ubuntu.com/utopic/amd64/libsqlheavy0.1-0/download).

When using Noise in Unity, everything works perfectly except the notifications. Instead of showing up as a notification in the notify-osd popup (in the top-right corner), all notifications from Noise show up as warning dialogs. So any time music has been imported into the library or when a song changes while the Noise window is not in focus, a dialog (with OK and Cancel buttons) with a warning sign (exclamation mark) appears.

[Serito Senpai (mistape13-pc)]

↑ Sorry for this ↑

Same problem in Ubuntu 15.10. I think it's all because Noise uses pantheon-notify for display notifications, but Unity uses notify-osd as default.

[Fabian Thoma (fabianthoma)]

I believe this is because ubuntu ignores part of the notifications spec which specifies that

>The actions send a request message back to the notification client when invoked.
> This functionality may not be implemented by the notification server, conforming
> clients should check if it is available before using it (see the GetCapabilities message
> in Protocol). An implementation is free to ignore any requested by the client. As an
> example one possible rendering of actions would be as buttons in the notification popup.

They basically state that to not break legacy applications they show that ugly pop up, where they really should just ignore the actions. You can read more about this here: https://wiki.ubuntu.com/NotificationDevelopmentGuidelines#Avoiding_actions

We should probably check for this, but really it's only ubuntu that ignores this spec, so it's kind of low priority right now.