The addon
BetterToolTips seems to have been orphaned - it was last updated Feb 2016, but the author hadn't logged in here since May, or Curse since April. Needless to say, it stopped working in Legion.
Is there something else that does what it did? Or is anyone willing to fanupdate this and/or take it over? Recreate it? I very much miss the functionality.
-Barleduq, wistfully