jejacks0n/mercury — comment on commit b30a4516bba090aa30c68078ba3ce0054aba015e
File: spec/javascripts/mercury/region_spec.js.coffee line 192
By JeanMertz:

Actually, not sure if you changed my implementation, but the preview class is still the old `mercury-region-preview`. I left it this way because it isn't introduced to the user as something they have to mess with, so we can leave it as is.