Proof of concept: Release v1.0.0 · Gabrielcarvfer/dia · GitHub
Forgot to update it. Much improved version with menu bar restored and other small things.
https://github.com/Gabrielcarvfer/dia/releases/tag/v1.1.0_2
Not sure if looking what AI did and learning from it is allowed (by that I mean not straight up copying it). If it is, let me know and I can help with patches. 