prevent multiwindow if halo enabled

please multi window stay out of HALO there !! , but we will leave you in
activity

HALO notification should open in floating window mode
PS1: If HALO is activated all HALO notifications will open in floating
window mode. If HALO is not activated notifications will open in
mutiwimdow mode.
PS2: If HALO is activated "add to split view" in the recent application
list will not be shown.