Disable Next button on PacksPanel if no visible pack is selected
Currently it is possible to unselect all packs in the PacksPanel and switching to the next panel. This is not intuitive and makes no sense from the user's point of view, even if there are hidden packs.
There should be at least one visible pack selected on the packPanel, either by the user or a required one, to show the user that something will be installed when he presses Next.
Disable the Next button as long as there is no pack selected.
I still get this issue in 5.1.2 - I have one hidden pack that is required and 3 visible selectable packs (not required) and the next button is still enabled when no visible pack is selected,