I don't think this is possible to implement inside Slingshot, and really we'd want it in a place where it can be more easily configured with other hotcorner actions. So, marking invalid for slingshot, but I am going to open it up for elementary OS.
I don't think this is possible to implement inside Slingshot, and really we'd want it in a place where it can be more easily configured with other hotcorner actions. So, marking invalid for slingshot, but I am going to open it up for elementary OS.