What turns two hyphens in to an em-dash, and how do I stop that?
When typing -- at least in basic applications such as TextEdit and Mail -- two hyphens get turned into em-dashes. I don't want this to happen. I freely type en- and em-dashes myself, and when I type two hyphens I want them to stay that way (for various reasons). What changes the two hyphens into an em-dash and how do I stop it?
MacBook Pro, OS X El Capitan (10.11.4), Hi-Res anti-glare wide screen