void adw_toast_overlay_add_toast ( AdwToastOverlay* self, AdwToast* toast )
Only one toast can be shown at a time; if a toast is already being displayed,
toast or the original toast will be placed in a queue, depending on
the priority of
If called on a toast that’s already displayed, its timeout will be reset.
If called on a toast currently in the queue, the toast will be bumped forward to be shown as soon as possible.
Available since: 1.0
The instance takes ownership of the data, and is responsible for freeing it.