Get the name of the unit which initiated the player's summon.
summoner = C_SummonInfo.GetSummonConfirmSummoner()
- string (nilable) - name of the player summoning you, or nil if no summon is currently pending.
- The function returns correct results after the CONFIRM_SUMMON event.
- Patch 8.1.5 (2019-03-12): Moved to C_SummonInfo.GetSummonConfirmSummoner. The previous alias is deprecated. 
- Patch 1.1.0 (2004-11-07): Added as GetSummonConfirmSummoner.