It has been challenging trying to get Gtk 3 widgets to play nice. Finally just rolled my own custom-drawn editor, treeview, and listbox. Going to release them later in a library.
You could also have used Mono.TextEditor btw. I personally find it better than GtkSourceView, and for having ported it to GTK# 3 myself, it was rather straightforward to port.
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.
I think it's cool that you did it, it's just not a language that I've seen get a lot of love.
And, Linux lacks any such tools. Not even VS Code has a plugin for VB.
I think it’s cool you built this. While I don’t think I will personally use this as all I do is more infrastructure stuff now, this still seems like a pretty project and I wish you all the best.