"Return the capabilities of the notification server, a list of strings.
The following capabilities can be expected:
- `:actions' The server will provide the specified actions
- to the user.
- `:action-icons' Supports using icons instead of text for
- displaying actions.
- `:body' Supports body text.
- `:body-hyperlinks' The server supports hyperlinks in the notifications.
- `:body-images' The server supports images in the notifications.
- `:body-markup' Supports markup in the body text.
- `:icon-multi' The server will render an animation of all the
- frames in a given image array.
- `:icon-static' Supports display of exactly 1 frame of any
- given image array. This value is mutually exclusive
- with `:icon-multi'.
- `:persistence' The server supports persistence of notifications.
- `:sound' The server supports sounds on notifications.
+ :actions The server will provide the specified actions
+ to the user.
+ :action-icons Supports using icons instead of text for
+ displaying actions.
+ :body Supports body text.
+ :body-hyperlinks The server supports hyperlinks in the notifications.
+ :body-images The server supports images in the notifications.
+ :body-markup Supports markup in the body text.
+ :icon-multi The server will render an animation of all the
+ frames in a given image array.
+ :icon-static Supports display of exactly 1 frame of any
+ given image array. This value is mutually exclusive
+ with `:icon-multi'.
+ :persistence The server supports persistence of notifications.
+ :sound The server supports sounds on notifications.
Further vendor-specific caps start with `:x-vendor', like `:x-gnome-foo-cap'."
(dbus-ignore-errors