This is a big deal (FontForge now using HarfBuzz for previews): https://mastodon.social/@iorsh@kishkush.net/114790529990510409

The old preview mechanics were inconsistent (and I think flat-out wrong for some RTL, though I don't read RTL so maybe I'm blaming the wrong component; the UI was bad, too).

Up there with migrating to GTK3 and making the Python package pypi-accessible on the "keeping the app usable for the next few years" list.