We didn't have a bug on this though I think I've seen discussion that we want to do it, so I thought I'd file one to track the work. Discover's install and remove buttons in desktop view should be tinted/colored the same colors that the icon uses in Mobile view: green for install, red for remove.
*** Bug 388883 has been marked as a duplicate of this bug. ***
This was always the plan: https://phabricator.kde.org/M53/134/ It's not possible to do in QQC2.Button. Should follow up on this.
This is the case on master now.