That would be possible actually, but it would probably require support from the IDE for letting language plugins filter which lines are shown in the editor (whi

That would be possible actually, but it would probably require support from the IDE for letting language plugins filter which lines are shown in the editor (which I don't think VS Code supports currently). Then the line numbers shown in the editor's gutter would be the line numbers defined in your code, and if you typed a new line starting with a line number, it could insert it at the location specified by the line number.