PLAYER_CHANGED_TARGET for target acquisition

[jukx]

I want to update my (oUF) frames each time the target changes or something is targeted in the first place. Initially I thought I could use the PLAYER_TARGET_CHANGED event for that, but it doesn't fire if you don't have a target and select something for the first time. Is there an event I could hook for that case?

edit: it's the UNIT_TARGET event
edit2: to find out which events fire during play, refer to the /eventtrace command