Little fixes, small enhancements
Explicitly specify arguments in signal handlers
ActionListItem: Fix up mnemonics shortcut behavior
It's a partial fix that at least unbreaks most direct usage of this shortcut in simple scenarios.
See also: #25
ApplicationListPage: Add icons to sort menu
Synchronized with KNewStuff, but some actions are unique and not exactly matching.
ApplicationListPage: Drop import versions, add QQC2 namespace
It is more conventional this way.
TopLevelPageData: Add Kirigami namespace
It is more conventional this way.
DiscoverWindow: Port footer's expression to optional chaining
BrowsingPage: Hide stray heading when there's nothing else to show
That's how all other headings and repeaters are hiding themselves too.
LabelBackground: Clean up unused imports, add QQC2 namespace
It is more conventional this way, and let's it work without discover app import which in turns allows side-loading it in a scratch QML file for easier testing.