tgp_bloc_change_cohesion_effect

tgp_bloc_change_cohesion_effect = {
	save_temporary_scope_as = bloc_temp
	$ICON$ = { save_scope_as = icon }
	save_scope_value_as = {
		name = cohesion_change
		value = $VALUE$
	}
	hidden_effect = {
		if = {
			limit = { scope:cohesion_change >= 0 }
			every_player = {
				limit = { house.house_confederation ?= scope:bloc_temp }
				send_interface_message = {
					type = msg_house_bloc_cohesion_change_good
					title = msg_bloc_cohesion_increased
					left_icon = scope:icon
					right_icon = scope:bloc_temp.leading_house
					desc = tgp_bloc_change_cohesion_$REASON$_tt
					show_as_tooltip = {
						scope:bloc_temp = { change_cohesion = scope:cohesion_change }
					}
				}
			}
		}
		else = {
			every_player = {
				limit = { house.house_confederation ?= scope:bloc_temp }
				send_interface_message = {
					type = msg_house_bloc_cohesion_change_bad
					title = msg_bloc_cohesion_decreased
					left_icon = scope:icon
					right_icon = scope:bloc_temp.leading_house
					desc = tgp_bloc_change_cohesion_$REASON$_tt
					show_as_tooltip = {
						scope:bloc_temp = { change_cohesion = scope:cohesion_change }
					}
				}
			}
		}
	}
	change_cohesion = scope:cohesion_change
}

As written in game/common/scripted_effects/10_dlc_tgp_house_bloc_scripted_effects.txt.