Internal tracking for quick effect item focus

focus used to be always forced to the root item of the view in the
"active screen" (which behavior is configurable between mouse poosition
and screen of active window)
now set focus to that particular view only if nothing is focused, also when
the user explicitly sets focus to an item in another view
remove focus to the old one so the item properly focused would be there

BUG:455807
BUG:455783
CCBUG:455633


(cherry picked from commit 66d12787)