Description of problem:
this is related, but not same as bug 20680

When updates are available, a notification shade is displayed in Gnome desktop, but times out automatically, and once it disappears you have to wait until the next update-check to get notification.

Furthermore you have to hover over it to have it display the action button to trigger the update, clicking the main part of the notification just dismisses the notification.

Reasons are twofold:

1) Instead of just the default expiry, the mgaapplet script explicitly closes the bubble/notification using

Glib::Timeout->add_seconds($timeout/1000, sub { eval { $bubble->close }; 0 });

this causes the notification not to show up in the calendar dropdown where other missed notifications would be collected.

2) removing this explicit closing of the notification is not enough however, since in their wisdom the Gnome-developers don't allow for additional actions in the calendar dropdown, so while you can now see a notification you missed in that dropdown, clicking on it just dismisses it since there is no default action.

Adding a action that is labelled "default" will solve this part

$bubble->add_action('default', N("Install updates"), sub { installUpdates() });

(instead of just action 'updates')

Using default action will have the effect of the shade-notification also be clickable/clicking the notification will have the same effect as waiting for the action button to appear and clicking that - and more importantly will trigger the update-dialog when clicked in the calendar-dropdown.

another quirk though, again in their wisdom Gnome-devs think it is a good idea not to close the calendar dropdown when an action is triggered, meaning you will have to close it manually before you can enter your password, as otherwise it likely will overlap the entry-window.


So again to fix this bug: 

* Don't explicitly dismiss the notification in the script, so it can appear in missed notifications

- Glib::Timeout->add_seconds($timeout/1000, sub { eval { $bubble->close }; 0 })

* make the missed-notification trigger the update when clicked by using an action with label 'default'

+ $bubble->add_action('default', N("Install updates"), sub { installUpdates() });