I actually had Claude do a lot of research into libraries. We tried a LOT of them before finding Gtk# 3 stable enough on the version used. What also was a factor was finding a version of dotnet on Linux that was stable for this combination. And it wasn't so much what would compile together, it was more what packages were available for MX Linux (my preferred flavor).

Gtk 3 has a weird way of doing scrolled controls that I couldn't accept because the nesting caused all kinds if issues. Also, the Gtk text control is incredibly slow when the file in it grows past 600 lines.

I wrote the editor control with an architectural design I created originally back in 2004, and subsequently lost. Much, much faster implementation. Took about 3 weeks with Claude.

Also wrote a treeview, listbox, colorpicker. Those took a day or two each with Claude. I will be releasing those controls in a dotnet library when I am finished with SimpleIDE.