> The entire Zed code editor is open source under GPL version 3, and scratch-built in Rust all the way down to handcrafted GPU shaders and OS graphics API calls.
When I saw this, I immediately wondered what strange rendering bugs Zim might run into. This was before reading your comment.
In my opinion, this type of graphics work is not the core functionality of a text editor, same has been solved already in libraries. There is no reason to reinvent that wheel... Or if there is then please mention why.
Most likely there were no ready libraries when they started. Even now there are very few that can be called stable. And even then many of them are HTML based.
So if you are going to spend that much time developing GUI from scratch you might as well make it your own library and get full control.
In my opinion, this type of graphics work is not the core functionality of a text editor, same has been solved already in libraries. There is no reason to reinvent that wheel... Or if there is then please mention why.