* Show selectable background behind "Show/Hide apps" button.
* Scroll to the relevant place in the list when showing/hiding apps.
* Only show one line (ellipsized) of the apps to update in header.
Alows for more flexibility in what we are able to display, including:
* Prompting users to donate to frequently updated apps
* Showing messages from package maintainers to users
* Marking apps for later installation when offline
Most of these are not yet implemented, but will be able to when
required, whereas they were not able to in the previous UI.