Absolutely nothing happens. Ligatures are a feature of fonts and font rendering engines. They do not affect the character codes. If you copy-paste from an edito

Absolutely nothing happens. Ligatures are a feature of fonts and font rendering engines. They do not affect the character codes. If you copy-paste from an editor configured with one of these fonts to an editor that isn't, you'll simply see the ordinary characters, because that's what was in memory the entire time.