KF6 removed actions.* properties. This commit creates a ScrollablePage adapter which aliases contextualActions to actions under KF6. In KF5, contextualActions is an alias to actions.contextualActions . Then we can use contextualActions in both KF6 and KF5 to specify page actions.

Type: fix

CCBUG: https://iron.lily-is.land/T85

Verify unit tests pass under KF5. Verify that we can proceed to RoomPage under KF6.