QUEST LOG UPDATE

Fires when the quest log updates. QUEST_LOG_UPDATE

Payload
None

Details
This event is fired very often. This includes, but is not limited to:
 * viewing a quest for the first time in a session in the Quest Log
 * every time the player changes zones across an instance boundary
 * every time the player picks up a non-grey item; every time after the player completes a quest goal, such as killing a mob for a ques
 * It also fires whenever the player (or addon using the or  functions) collapses or expands any zone header in the quest log.