WIP because I couldn't figure out how to reset the active sidebar selection.
when the intro page gets shown, (again binded from a bool property arriving from c++)
categoryView.currentIndex should be set to -1,
and systemsettings.activeCategory to -1 as well
this should be a bool property setter
would be nice to have this disabled when on intro page.
I would prefer overflow-menu
can you take a look? should be fairly simple
const int newCategoryRow = to have -1 when the passed cat is -1
also, SidebarMode::changeModule to get special casing for invalid qmodelindexes