Compton: Funky Double Shadow on Evolution menus

 
Started playing a bit with Compton, and I've noticed an annoying double shadow with the menus on Evolution (picture on the right).
To get rid of those, add this to the ~/.config/compton.conf file:

 "class_g ?= 'Evolution'",

On the shadow exclude options section of the configuration.
Close Evolution, restart Compton and start Evolution once again and the menus will have a proper drop shadow (picture on the left).
Be aware that after issuing this snip on the config file, you'll loose the drop shadow effect on all Evolution windows, but, IMHO, that's a small price to pay to get rid of that awful double shadow on menus.