Scrolling App List is Laggy

[Zren]

Flame Graph of scrolling up and down

The main cause appears to be the svg loading in AppToolButton.

So we should probably reuse those components.

[Zren]

Using a Loader { source: "AppToolButtonStyle.qml" } doesn't help. It's still loading the svg (... from file? from the cache?) every single button instance.

If we remove the svg/shadow code, there's no lag when scrolling (since it's just Labels + Layouts left).

I'm thinking of just doing "fluent design" buttons like we used for the tiles till I've figured out how to properly load the svgs.