@lanodan @feld I was trying to write a replacement for a popular go tui and I figured out supporting flex-like arrangements (ratio sizing etc) to use for dashboards and stuff. Unfortunately between several competing issues, and the person who really wanted me to finish it for his company dying, well I'm sure I'll get back to it eventually lol.
I had several use cases for it myself, notably a now-abandoned LTE/5G antenna alignment tool (no longer use that for home Internet)