--use ScreenPool as reference for primary screen.
The new code uses PrimaryOutputWatcher class from
Plasma Shell in order to keep track of primary
screen at all cases.
BUG:448418
FIXED-IN:0.11.0
--plasma is doing some funny stuff in multi-screen
environments by changing screen ids and back and forth
when primary screen is changed. We now take into account
this and when screen plasma pools updates its ids in
any case the wallpapers tracking follows instantly.
-- Latte screen ids are different from plasma
screen ids. This class helps in order to help
translating the different screen ids between
Latte and Plasma.
Michail Vourlakos
Alexander Lohnau